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18.
Back (n.)- Used to describe a person who enjoys cheesy sticks.

(v.) To Back is to act irrationally, accompanied with a period of silence and glaring stares (usually proceeding a date party or Rosarito)

(adj.) Someone overly Brazillian or one who whistles off-tune incessantly.

(adv.) A re-telling of a story that is inherently funny but is made naught by a mundane, and pause-ridden rehashing of said story.

(pronoun) Substitute for one who is obsessed with Elaine through the means of Facebook, whether it be from Seinfeld or otherwise.
(n.)- Let's go to Blondie's, I feel like a Back right now. Sure I'll pay for Brette and then lose respect from here to here for her.

(v.) Natalia got another Fiji boyfriend? Dude, stop being such a buzz-kill. Ukh, stop Backing.

(adj.) San Paulo is safe? You don't need to worry about burglaries? You are such a Back optimist.

*Alternate Usage* Heather- "I am in such a Back mood."

(adv.) That story of Dick Cheney shooting the lawyer was so funny until you Backed it.

(pronoun) Dude, you've never met her before. She updated her About Me and Status? You are being such a Back.
by Apartment 205 April 17, 2007
 
1.
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
 
2.
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
 
3.
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
 
4.
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
 
5.
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
 
6.
Backs is a new revolution in drinking games, created in the small town of Wyoming, Ohio. If you've ever played jacks as a child and enjoyed it, this game is for you.

Instructions: Players sit in a circle, each person holding their own drink, which the group decides on. Then one at a time, the players bounce a bouncy ball in the air. While the ball is airborne, the player tries to chug their beverage before the ball hits the ground. First player to finish wins the game. Everyone goes one at a time, passing the ball after each turn.

Restrictions: If a player bounces the ball and it hits the ceiling, they are then required to finish the game naked.
Steve: Man I'm pissed I don't have a ping pong table, we can't play any drinking games.

Sarah: No worries, I have a bouncy ball we can play Backs.

Steve: Righteous
by snPei April 10, 2011
 
7.
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