1. whoop ass - Noun
2. whoop ass - Verb
(idiomatic, slang, vulgar, US) To beat or strike.
(idiomatic, slang, vulgar, US) To defeat in a fight.
(idiomatic, slang, vulgar, US) To defeat or excel against (someone) in a competitive event.
whoop-ass
Alternative form of whoop ass
(figuratively, slang, US) An act of beating.
(idiomatic, slang, US) A fight.
(figuratively, slang, US) Strength or will to fight or compete.
Source: en.wiktionary.orgwhoop-ass