pop a cap in someone's ass

== English == === Etymology === From cap (“bullet”). === Pronunciation === === Verb === pop a cap in someone's ass (third-person singular simple present pops a cap in someone's ass, present participle popping a cap in someone's ass, simple past and past participle popped a cap in someone's ass) (slang, vulgar, originally African-American Vernacular) To shoot someone with a gun. Synonym: cap