(slang, vulgar, originally, _, AAVE) To shoot someone with a gun.
The older teen was coming from "Tilt," the second floor arcade, when the shooter confronted him, threatened to "pop a cap in (his) ass," and, after the victim assumed what eyewitnesses say was a fighting stance, apparently did.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.