Slang used in everyday conversations by GI's

ACTING JACK Sergeant E-5, not officially promoted but allowed to wear the stripes as acting NCO
AAF After-action report
AFVN GI radio station operated by the Department of Defense to provide news & entertainment to the troops
AMMO DUMP Location where live ammunition is stored
AO Area of operations
ARTY Slang for artillery; large cannon capable of delivering rounds up to several miles, either towed or self-propelled. 105mm, 155mm, and 8 inch were the most common sizes in Nam
BASE CAMP A re-supply or stand down base for field units; also know as the rear area
BASE CAMP COMMANDO A soldier station in the rear at a base camp who goes around dressed and acting like RAMBO but will never have to go out into the field
BEANS AND MOTHERF**KERS C-ration lima beans and ham (no one usually wanted these
BEETLE NUT A nut chewed by the locals causing their teeth to turn black.
BIRD Any flying machine.
BIRD SERGEANT SP5, the same pay grade as a buck sergeant,
BODY BAG Plastic bag used to transport dead bodies from the field
BODY COUNT Number of enemy killed.
BOONIES Slang for the field, areas far from the comforts of base camp
BOWL Pipe used for smoking dope
BRACKETED Term used by artillery and/or mortar man to describe the result of at least two rounds of fire (one over - one under the target is a bracket)
BS Bullsh*t, as in chewing the fat, telling tall tales, or telling lies.
BULLSH*T FREQ The highest frequency on the tactical FM radios which units used in Viet Nam. Often at night, GI's would turn their radio to this frequency and chat with friends in other units scattered around the AO.  Probably one of the enemy's best sources of intelligence on us,  but a party line connection to friends for some soldiers
BUNKER GUARD Fortresses made of wood and sandbags positioned around a base camp or LZ for perimeter defense. Soldiers occupied these structures on a daily basis. Towers were also constructed to aid in early detection of the enemy.
BUMMER  Bad luck or a real drag
BUMMER BIRD Airplane one would take to Nam
BUSH Anything outside the perimeter
BUTTER BAR 2nd Lt
C-4 Plastic explosive, dull white in color with the consistency of Play-Doh. Very powerful, but will burn without exploding when lit with a flame. Useful for heating C-Rations, water, warming hands, igniting the diesel fuel used to burn waste from the latrines, and blowing up things.  Usually packaged in one pound bricks wrapped in plastic or 1/4 pound sheets about 1/16 thick. Though more powerful than TNT or dynamite, it is very stable.
CACHE Hidden enemy supplies
CAV Cavalry (Airmobile i.e. 1st Cav or Armored i.e. 12th Cav)
CHEAP CHARLIE Anyone, especially a U.S. serviceman, who does not waste his money
CHARLIE Viet Cong - the enemy
CHEESE Slang for the charge used to propel a mortar round. As in: Two and a quarter cheese
CHERRY Slang for youth and/or inexperience
CHEU HOI PAMPHLETS Propaganda leaflets were dropped by high flying U.S. aircraft and were found everywhere around the Vietnamese countryside. They encouraged NVA and VC soldiers to surrender or defect to the US/South Vietnamese side, and offered safe passage to any enemy soldier
COMMO Slang for communications
CONTACT Coming into contact with the enemy
CP Command Post
C-RATIONS Field Rations
CRISPY CRITTERS Burn victims
CS A riot-control gas that burns the eyes and mucus membranes
DAP Handshake and greeting which may last up to ten minutes and is characterized by the use of both hands and often comprised of slaps and snaps of the fingers. Used by black soldiers, highly ritualized and unit specific
DEROS Date of Expected Return from Overseas; back to the big PX or the World
DEUCE-AND-A-HALF Two-and-a-half ton truck
DICKED Having it dicked,  meant that you had it made, you were in a real advantageous situation, like being a lifeguard at China Beach. Also related to this phase was a "dick job" which was an easy job. I believe the word was used to indicate the similarity between your dick and what ever the easy job or situation was
DINK Derogatory term for an Asian
DMZ DUSTOFF Call sign of the helicopter medical evacuation unit that served our AO. When someone was hurt, rather than dialing 911, we would have 30 Yankee call DMZ
DMZ Demilitarized zone; the dividing line between North and South Vietnam as established at the Geneva Convention in 1954
DOC Medic
DONUT DOLLY Red Cross women who would occasionally (rarely) visit us while we were in base camp. They brought snacks and organized games and entertainment to provide a bit of relief from the typical routine of being on duty 24/7 in a combat zone
DUST-OFF Medical evacuation by helicopter
DX Direct exchange. Also, to discard or dispose of, or to kill someone
EARLY-OUTS A soldier with 150 days or less remaining on his active duty commitment when he would DEROS from Vietnam would receive a reduction in time and receive an early discharge.  Most Troopers were smart enough to find a job in the rear but then some of us were not cut out for the rear
EVAC'D Evacuated.
FART SACK Sleeping bag
FIRE BASE Temporary artillery encampment used for fire support of ground troops
FIREFIGHT Exchange of small arms fire with the enemy; a battle
FIVE Radio call sign for the (XO) executive officer of a unit
FLAKY State of mental disarray; spaciness.
FNG F*cking New Guy
FO Forward observer; person attached to a field unit to coordinate placement of direct and/or indirect fire from ground, air, and naval units
FRAGGING Intentionally killing or wounding of your own soldiers by a grenade
FREE FIRE ZONE Area where everyone was deemed hostile and a legitimate target by U.S. forces
FREEDOM BIRD Plane that took soldiers from Vietnam back to the World
FRIENDLY FIRE Accidental attacks on U.S. or allied soldiers by other U.S. or allied soldiers
FSA Forward support area; one stop service base established by logistical units near an operation or forward base camp
FUBAR F__ck Up Beyond All Reason or Repair
F*CK Most commonly used word in the GI vocabulary (f*cked - f*ckin - f*ckin A)
F*CKED UP Wounded or killed. Also to get stoned, drunk, or do something stupid
F*CKING A CHICKEN The GI sleeping bags we were issued in Viet Nam were stuffed with goose down. They were really pretty good sleeping bags, and rather functional on the cool, wet nights that we had during much of the year. Even when it was hot they provided padding from the hard ground. Occasionally they would tear, however, and if the inside of one ripped open during the night, and a trooper did a little tossing and turning in his sleep, he would emerge from the sleeping bag covered with feathers. When that happened, he would usually be greeted with the question "what have you been doing, fucking a chicken?
GETTING OVER Meant that the person really had a very easy time of it, but the job he was doing looked hard.
GOOK A generic term for Vietnamese. Also interchangeable with "Slope" and "Dink."
GREENIE A new trooper (NEWBIE or FNG same meaning).
GREEN WEENIE, THE BIG What the Army slipped to you when you least expected it.   You have less than a week left in country but you're still out in the field  or on the road
GRIDS Map broken into numbered thousand-meter squares.
GRUNT Infantryman
GUNG HO Enthusiastic  about military matters
HAMLET Small rural village
HAMMER AND ANVIL Tactic of  surrounding an enemy base area, then sending in units to drive the enemy out of hiding.
HEADS Those who smoked marijuana. "Juicers" used alcohol. There were those that did both, there were those that did none.
HERRINGBONE A defensive procedure by which armored vehicles going down a road or trail would turn out in alternating left & right directions at a 45 degree angle. Effective in dealing with ambushes from both sides of a road, or in setting up a hasty defense during short pauses in a road march.
HO CHI MINH SLIPPERS Sandals made from tires, the soles are made from the tread and the straps from inner tubes
HO CHI MINH TRAIL Jungle paths through Laos and Cambodia which serves as the principle Viet Cong and NVA supply route
HOOCH Dwelling (military or civilian)
HOT Area under fire
HQ Headquarters
IN-COMING! Always yelled to alert troopers to incoming enemy rockets, mortars, and etc.
IN-COUNTRY Vietnam
INJUN COUNTRY Anything outside of a base camp
IT DON'T MEAN NOTHING Was a phrase you said when you were really disappointed, and that something really meant something to you.  It was a thing to say to keep you from going crazy.
H & I Harassment and interdiction; random fire used to deny the enemy terrain which they might find beneficial
JOHN WAYNE To describe the actions of someone who exposes himself to danger
JOHN WAYNE BARS Round, flat, chocolate bars with crushed nuts that came in some C-ration meals. Really a pretty good snack or desert to finish off the usually C-ration main course.
KIA Killed In Action
KILL ZONE Area around an explosive device within which it is predicted that occupants will be killed
KIT CARSON SCOUT Former Viet Cong or NVA soldiers who act as guides for U.S. military units
KLICK Kilometer (1,000 meters)
KP Kitchen Police; mess hall duty.
LAAGGER A circular formation, like the old pioneer's circling the wagons.
LBJ Long Binh Jail, military stockade at Long Binh
LRRP Long Range Recon Patrol, infantry type who operated in the field for days/weeks at a time with little support, scouting the terrain for enemy activity
LIFERS Were enlisted men who usually had rank. They intended to stay in the army until they retired. The hippies who found themselves in the army used the term with derision. The gap between the unranked enlisted and the lifer was wide indeed and only a few lifers, who earned the respect of their men because of their leadership ability, could bridge it.
LIMA CHARLIE Slang for loud and clear
LIT-UP Fired upon
LP Listening Post. Two or three man position set up at night outside the perimeter away from the main body of troopers, which acted as an early warning system against attack
LT Lieutenant
LZ Landing Zone. Usually a small clearing for the landing of re-supplies helicopters. Some become more permanent and eventually base camps
LUKE THE GOOK Slang term for Vietnamese, especially VC or NVA
MACV Military Assistance Command / Vietnam. The main American military command unit that had responsibility for and authority over all U.S. military activities in Vietnam
MAD MINUTE Weapons free-fire practice and test session
MAMA SAN Any older Vietnamese woman
MARVIN THE ARVN Was a South Vietnamese soldier.  ARVN being an acronym for the Army of the Republic of Vietnam.  It was a perfect name for an imperfect soldier
MERMITE CANS Large insulated food containers
MIA Missing in action
MPC Military payment currency; the scrip U.S. soldiers were paid in
NAM Vietnam
NDP Night defensive position
NET Radio frequency setting, from "network"
NO SWEAT Easy, simple
NVA North Vietnamese Army
P'S Piastres,  basic Vietnamese monetary unit; $1 equaled about 118 Piastres
PERIMETER Outer most edge of a military position
PLASTIC Type of explosive favored by sappers
POINT Forward man or element on a combat patrol
POP SMOKE Set off a smoke grenade, mark your position
PRC-25: (PRICK 25) Portable radio communications, Mode l25, a backpacked FM receiver-transmitter used for short-distance communications. The range of the radio was 5-10 kilometers, depending on the weather, unless attached to a special, non-portable antenna, which could extend the range to 20-30 kilometers.
PTSD Post-Traumatic Stress Disorder, development of characteristic symptoms after the experiencing of a psychologically traumatic event or events outside the range of human experience usually considered to be normal. The characteristic symptoms involve re-experiencing the traumatic event, numbing of responsiveness to, or involvement with, the external world, exaggerated startled response, difficulty in concentrating, memory impairment, guilt feelings, and sleep difficulties
PX Post exchange/military store
PUCKER FACTOR The higher the number the greater the fear factor
R & R Rest and recreation; a three to seven day vacation. (Sometimes know as I & I).
Rest and Relaxation. All the troopers were authorized a one week R & R trip to a location out of Viet Nam during their tour. Sometimes referred to as I & I for intoxication & intercourse, most Cav Troopers took advantage of their R & R to visit historic, cultural, and educational facilities in the orient, such as bars & brothels. Some guys enjoyed the experience so much they forgot to return to Viet Nam.
REAL LIFE Slang for civilian life
REAR This was the "rear echelon" or behind the lines. Support units were in the rear. Hot showers and hot food were in the rear. It was safer in the rear. Movies and clubs were in the rear. However, during some actions, the rear could be in the middle of the NDP, or 10 feet behind the guy in front, in a defilade. Almost everyone in the field wanted to be in the "rear."
RECON BY FIRE A tactic consisting of placing a few bursts of machinegun or M-79 fire into an area before getting within range of an ambush. Basically, you could shoot at anything that the enemy could hide behind in order to flush them out, or make them reveal themselves while we were still some distance away
RECON IN FORCE The politically correct way of saying Search and Destroy as not to offend the American public
REDBALL System to expedite delivery of critical supplies and repair parts in Nam
REMF's Were Rear Echelon Mother F*ckers and reviled by the field troopers. REMF's had a safe life in the rear. The war was such that almost every major LZ or base was very safe, while the field was very dangerous. Lots of times, very little distance separated the rear from the field. Every field soldier secretly wished he were a REMF
RHIP Rank Has Its Privileges, remark made when the troops felt they were being screwed by higher ups
RINGKNOCKER Graduate of a military academy, refers to the ring worn by graduates
ROCK'N'ROLL Firing a weapon on full automatic
ROK Soldier from the Republic of Korea Pronounced "rock", the ROK's were rumored to be cruel & ruthless towards the Vietnamese
ROME PLOW Mammoth bulldozer used to flatten dense jungle or clear 100-meter wide paths through it
ROTATE For military personnel who still had time remaining in the service; to return to the U.S. at the end of a year's tour in Vietnam
ROUNDEYE Slang for Caucasian women in Nam.
RTO Radio telephone operator; man who carried his unit's radio on his back in the field
RF's and PF's or "Ruff & Puffs" Were Regional Forces and Provisional Forces. These were irregular South Vietnamese militia that were advised by Special Forces A teams. They lived in hamlets and/or villages. They pulled security for their government-sanctioned hamlets or villages. As soon as the North Vietnamese came rumbling down Highway 1 in 1975, the Ruff & Puffs crumbled like coffee cake.
RVN (Are-vin) any member of the Vietnamese Armed Forces; Republic of Vietnam.
SADDLE UP Prepare to move out
SALVO Firing an artillery (for example) battery in unison
SAPPER A "sapper" is a NVA or Viet Cong soldier who is specially trained to infiltrate American defensive perimeters. Usually dressed only in shorts or naked and carrying a single weapon, be it a satchel charge (large explosive in a sack, usually having a handle for easy throwing) or a single RPG, he is able to slip under, around, and through perimeter defenses to wreak havoc on the unsuspecting US soldiers who are half-asleep in their bunker. They often precede all-out ground attacks by taking out a bunker or other defensive position at the point of attack.. They'll do things like turn claymore mines around to face the American soldier, then crawl away, make a noise and see what happens. They are unstoppable, almost magical in their abilities. There is a Vietnam movie called "Hamburger Hill" that shows a defector-sapper penetrating the wire while the new guys watch, amazed
SEARCH AND DESTROY An operation in which American Forces searched an area and destroyed anything, which the enemy might find useful
SHAKE-N-BAKE Sergeant who attended NCO School and earned rank after only a very short time in uniform.    During the Vietnam Era the Army need a quick supply of NCOs' in the combat arms MOS.  
SHAMMING  Goofing off or getting by with as little effort as possible
SH*T Was something you knew. As in, "Listen to that PFC, he knows his sh*t."
SH*T BURNER  In the firebases, it was common practice to build wooden "outhouse" latrines, with a 55 Gal. drum under the seat for feces and toilet paper to go into. Once or twice a day, the fecal waste would be disposed of by burning. Someone would get the duty of pulling the 55 Gal. drums out of the outhouse, pouring a couple of gallons of diesel fuel into them, and burning the sh*t. In a good unit where everyone was performing to the best of their abilities, the sh*t burning duty was rotated on a random basis. If a trooper had been goofing off, or getting into trouble, a few days of duty as the sh*t burner would often motivate him to be more of a team player and optimal performer in his regular duties
SH*T BURNING Sanitization of latrines by burning of excrement
SHORT Term used by everyone in Vietnam to tell all who would listen just how soon he would be going home. (I am so short I cannot see over the tops of my boots and etc. One had to top another short timer when it came to the question "just how short are you?")
SHORT-TIMER A trooper with not much time left in country (in Vietnam)
SHRAPNEL Pieces of metal sent flying by an explosion
SIT-REP Situation report Situation Report. Status report called into higher headquarters by radio. Usually at night if operating separately the unit's would each call in a SIT-REP to the rear once an hour, just to let them know that we were still in radio contact and had not been horribly killed by the unseen communist hoards
SIX Unit Commander
SKATE Task of accomplishment that required little effort
SLOPE Slang term for an Asian person
S.O.S. Abbreviation for "Sh*t on a Shingle", slang for an Army food consisting of meat in a gravy put on plain white bread. Recipe
SPIDER HOLE Camouflaged enemy foxhole
SPOT REPORT Radio report of enemy action or movement, or any other important event
STAND DOWN unit's return from the boonies to the base camp for refitting
STEAM & CREAM Slang name for the military operated steam bath and massage parlors at some of the larger bases. 
TAIL-END CHARLIE Last unit in a long column on the move
TC Was a track commander
THE BIG ASS Was truly big. "He's happy for the big ass," meant the guy was happy indeed. Which was different from "having a case of the ass" which meant you were pissed off
THERE IT IS Was a phrase we used as a comment whenever someone said something profound or something true.  Like if someone said, "this place really sucks."
TIGER PISS Slang for Vietnamese beer, real name was 33 or Baum Di Bau (or something on that order)
TIGHT Good friends are close to ("tight" with) each other
TOC Tactical Operations Center
TOP Top Sergeant of a unit
TROPICAL BARS Hard chocolate candy, specially designed to be heat resistant so it wouldn't melt under the sun of Viet Nam. They came in SPs (See above). So hard that you could barely bite through them. Not especially good tasting. Not popular with the troops
USELESS Pun on USIS, United States Information Service
USO United Service Organization; provided entertainment to the troops and was intended to raise morale
VC Viet Cong (Victor Charlie) the enemy
VILLE Vietnamese hamlet or village
WAKEUP The troopers final day in country. "I have 3 days and a Wake Up left."
WASTED/WAXED Killed.
WEED Marijuana
WHAT THEY GOING TO DO? SEND ME TO 'NAM? This phrase was said when you did something slightly wrong or you expressed a politically incorrect thought. It was said to point out that the authorities couldn't do anything worse to you than send you to 'Nam, because you were here already there
WHITE MICE South Vietnamese police. The nickname came from their uniform white helmets and gloves
WIA Wounded in action
WORLD United States
WW Walking Wounded, hurt but still able to fight
YARD Short for Montagnard, any one of a number of semi-nomadic people
Z Short for DMZ
ZAPPED Killed