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Generally thought to mean shooting someone; often used in rap slang.

This is incorrect.

"Bust a cap" comes from 1890-1920 Irish gangs, in New York City. It referred to breaking someone's kneecaps.
MacDonald refused to pay tribute, we had to send our enforer Murphy down there to bust a cap.
by VivaRedChe September 30, 2009
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To discharge a round of ammunition from a firearm, usually a handgun.
"Fuck wit me, and I'll bust a cap in yo ass, biatch!!"
"That fool was disrespectin' a brutha so I had to straight bust a cap in his ass!"
by Street Shakespeare December 5, 2006
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1. shooting somebody (usually with a handgun)
2. coming/climaxing in somebody
1. IMMA BUST A CAP IN YO ASS
2. IMMA BUST A CAP IN YO ASS
by biiiiiiiiitch! December 3, 2010
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A black/ghetto person shooting a gun at someone. This does not apply to Latinos, they are not ghetto.
by Christy L December 17, 2009
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(v.) for police officer to arrest headwear.
Okay Nikegolf cap, you're busted. Tiger ain't wearin' you no more.
by Gumba Gumba May 20, 2004
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mrs. walker and her first period class
(said while shaking a pen)if you guys arent quiet i will bust a cap
by g-unit April 29, 2003
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