whoop-ass

Short definition from Wiktionary

Verb

1. 1
   Alternative form of whoop ass.
2. 2
   To beat or strike.
3. 3
   To defeat in a fight.
4. 4
   To defeat or excel against (someone) in a competitive event.

Noun

1. 1
   An act of beating.
2. 2
   A fight.
3. 3
   Strength or will to fight or compete.