Slang for gun. Contrary to (apparently) popular belief, it is not a term created by modern rap stars, but has been in use since the prohibition era.
"scene kids ghetto stars come on grab your gats"

"that night at 82 the parking lot was stacked. grabbed my gat and got my hand stamped by matt."

THANK YOU HOLLYWOOD UNDEAD.<3
by x.emilyyy July 04, 2006
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contrary to the popular belief the the word gat comes from the prohibition era, the actuall word "gat" comes from the name of Richard Gatling. Richard gatling, in the mid1 18- late 1800's, designed the original Gatling gun, a 6-10 barreled rotary weapon that used a hand crank to turn the barrels, load a cartridge from a magazine located above the firing mechanism, and fire the gun. this weapon inspired others such as Hiram Maxim to develop the Maxim '08 with the two most common calibers be 7.92mm mauser and .303 enfield. this gun also also inspired the 7.62mm minigun and GAU-8 30mm cannon. since modern machine guns, both multi barreled and single barreled derive their origins in the gatling gun. over the years the word gat has come to mean any self loading semi auto or full auto weapon. (handgun or machine gun.
get your gat, lock and load, we're going to war.
by Fitzy7990 December 24, 2008
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etymology: perhaps from 'gat' in "gatling gun," akin to Richard J. Gatling, American inventor.

A firearm.
I had to shut up: the dealers had gats, my boys didn't.
by Deus ex machina March 22, 2003
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“Gat” a slang term most commonly heard in south Philadelphia meaning “dick” or “penis”.
Person 1: yo jada Just spoiled that whole ass movie for me

Person 2: yo she can suck my fucking gat
by Liptonlily April 26, 2019
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Slang for a gun, but not that you wiggas care, it actually comes from the prohibition era, usually referencing the Thompson (Tommy) gun. Its doesnt come from rap or California. Sorry boyz.
How you importing the whiskey from canada? With balls of steel and some boys with gats.
by Crayola February 16, 2005
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