GAT 

Gay After Three: a person whose sexual orientation changes after three alcoholic beverages.

Boy A, "Hey, did you see Emma and Melissa hooking up at that party last night?"
Boy B, "Yeah, they're total GATs"

GAT by Concerned C!t!zen January 14, 2009

Gat 

A gun-
synonyms

piece
heat
glock
nine
.22
.45

know what I'm sayin? That fool jus took his gat and wasted that dude glock glock and shit

Gat by Billy Bush September 2, 2005

Gat 

Old definition: A gun
New definition: a slang term used by ghetto men to describe their penis, often in relation to sex.

Douche 1: Yo, she want da gat!
Douche 2: Yeah, she a thot, and she be fucking niggas left and right yo!
Douche 1: Imma fuck dat thot tonight, get ma dick sucked!

Gat by criedman101 March 16, 2014

gat 

a gun, probably referring to Richard Gatling, the inventor

if that nigga tries to fuck with my slab, i'm gonna have to blast my gat

gat by kaybee March 12, 2004

Gat 

handgun used in lamest terms to describe a bullet firing arm

i bust my gat at them fools after they shot pookie

Gat by 1che July 25, 2003

GAT 

stands for "Gay Alaskan Triplets," the three identical gay babies which Sarah Palin gave birth to in 1986 and then aborted. HAHA!

You heard about GAT?
Palin's aborted gay triplets? Sure! What a waste, that was her only redeeming quality.

GAT by homosexuality September 28, 2009

Gat 

Simply put, a GAT is someone who is both Gay and fAT, and usually rejected by society.

Chris, you're such a GAT.

We got the rap patrol, on the GAT patrol.

Gat by Chamato December 26, 2006