The origin of
bust a cap meaning to discharge a firearm has become a general threat of violence with
the implication that a gun will be involved. To threaten to bust a cap in someone's ass is also not intended to be anatomically specific, as kick ass or whip your ass are not descriptive of specific actions against someone's posterior. Ass as in "your ass" "my ass" etc refers more to the whole of the physical person. Further appellations such
Honky, nigga, nigger, white boy, bitch, etc. are context dependent and may not have racial or gender implications.
"I'm gonna
bust a cap in yo ass" "I would never
bust a cap in your ass" "Please don't bust a cap in
my ass" etc
