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An especially fine woman's butt.
So ladies (yeah), ladies (yeah)
If you wanna role in my Mercedes (yeah)
Then turn around
Stick it out
Even white boys got to shout
Baby got back

All credit humbly given to Sir-Mix-a-Lot
by baby got it goin' on February 13, 2004
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A reference to the buttocks, usually referred to woman who have a bigger than normal ass.
"Daaaammmnnnnn, baby got back!"
by Alex A. February 18, 2003
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Is a term used by (usually) pot smokers though it can be used when a group of people are smoking (sharing) anything. The person who "calls" "backs" gets to take second hit. Kind of like calling "shotgun" for passenger seat of a car...
*Todd prepares to spark the blunt..

Rodd: I got backs!

Dodd: Fuck, I got trips

Dick: shit that means I'm last. Technically this is better for me because the smoke from the smoked weed passes through the blunt and deposits THC resin on the bud that it passes through to get the mouth end of the blunt. This means my first hit will yield more THC for me. Yet, it also means that I will have a smaller number of total hits on the blunt. This means I must chief on the blunt like a motherfucker.
by ysf June 17, 2009
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A (navy) call made when you have to get past someone in the passageway, or to announce your presence in the room.
As Roof enters the mess he would call "backs" which would result in a response of "backs" by every member in the mess. A non-response generally means that the paticular members sexuality is questioned.

"Backs, big unit coming through" as Parko or Reid pass you on the way to 2 Mess.
by newcastlecoons August 31, 2008
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A back is a non-alcoholic drink served alongside a shot. Backs are also sometimes called chasers. Sometimes a small beer served alongside a shot is considered a back.
Gimme a shot of whiskey with a coke back.
by Learn to Swim August 12, 2008
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it is reffered to somes ones bum,
either boy or girl
*girl with big bum*
"look that girls got backs"
by bbygyal123456 January 28, 2009
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verb. 1) to tell someone to "chill"; relax, fall back. 2) commonly used to shut down a stupid remark or completely end a conversation. 3) also used to completely shut down a stupid action another person does. 4) a more stronger form of the verb consists of a double back; i.e. "BACK BACK!". this phrase originated out of the vicinity of Mt. St. Joseph High School in historical Irvington, around the period of 06-07 school years. Its popularity has grown and continues to flourish amongst the Mt. St. Joseph Community and is begining to spread at a rapid paste. Although to term's weight itself is hard to grasp, one must take time as practice to completely master its effectiveness

see corresponding examples from definitions...
1) Stupid Kid: "Hey man guess what I did last weekend?"
Beastly Kid: "What man?"
Stupid Kid: "I got so much ass from these hott chics from _______"
Beastly Kid: "Uh... BACKKK!"
2) Stupid Kid: "Hey man you know who u look like?"
Beastly Kid: "Who?"
Stupid Kid: "Abe Lincoln hahaha"
Beastly Kid: "BACKKK!"
3) Stupid Kid: (decides to go to weight room and put on some rap and dance to it)
Beastly Kids in Weight Room: "BACKKK!"
4) Stupid Kid: "Dude im so nice at basketball"
Beastly Kid: "Uh... Back"
Stupid Kid: "Yo i'd fry you"
Beastly Kid: "BACK BACK!"
by Ca$h MunE May 18, 2007
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