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gat
Old slang, meanging gun. Came from shortening Gattling gun to just gat. Was used during the prohibition era to name any gun, but specifically the thompson submachine gun, aka The Tommy Gun.
Just get that gat out of my face, and everything will be jake.

or

Sorry guys, but no rapper or gangsta came up with the word Gat. Or chopper, for that matter. Unless you're talking about the prohibition era bootleggers type of gangster, that is.
gat
A firearm, usually a pistol or open-bolt submachinegun, used for busting "caps" into someone/something's
"punk ass."
"That hater talked mad trash about me, so I pulled out my gat and busted a few hollow tips up in his fat ass"
Gat
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.
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