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3. pop a cap in (someone's) ass

pop a cap in (someone's) ass

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pop a cap in (someone's) ass

slang To murder or attempt to murder someone with a gun. Primarily heard in US. If you don't get out of here right now, we're gonna pop a cap in your ass! They popped a cap in his ass when he began hurling racial slurs at them.

See also: ass, cap, pop