- open a can of whup ass
- open a can of whoop-ass
From English whoop (variant of whip) + ass
open a can of whoop-ass
- (idiomatic, slang, US) A good-humored threat of physical harm.
- I'm gonna open up a can of whoop-ass on ya.
- 1998, Robert Fletcher, No rush to see new Chan, University Wire
- Chan stars in his first all-American production as chan as Hong Kong Detective Inspector Lee, a noble, innocent and caring police officer who can really bust open a can of whoop-ass when given the chance.