and wouldn't being shot in the butt also show you to be a coward? You were obviously running away.
Not necessarily because you could have been protecting someone by shielding them from an oncoming bullet.
and wouldn't being shot in the butt also show you to be a coward? You were obviously running away.
I think it's an example of alliteration and onomatopoeia; the adjacent "pop" and "cap", both of which imply action, can both mean to finish or to kill off. So it generally means to "whack" or "take out".
"I oughta pop a cap in your [...] [...] ass".
"Your ass" is a synonym for "you", and "ass" often gets prefixed with another contextual epithet, e.g. "dumb", "white", "nigger", "theivin'", "junkie"; and with other, more expansive terms.