pop a cap in (someone's) ass(redirected from pop a cap in his 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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.