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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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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History of term: This refers to a toy gun for children that can be loaded with little white powder caps that create a bang sound and small amount of smoke when the trigger is pulled. The word "cap" in the term is derived from the name Capulets . one of the fueding families in the shakesperean drama Romeo and juliet. when used in the term "bust a cap" it is also refering to the theatrical and seemingly gang related interpretation of the play by high school level students.
"Bust a cap on that fool"
by Mr.Lex Luther March 2, 2017
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Girl, don't even go there, unless you want me to Bust-A-Cap :*
by I love you March 30, 2005
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to put a bullet in someone; to shoot someone
u better bust a cap in a nigga before he get away
by 4bebo June 10, 2008
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