kick ass

Short definition from Wiktionary

Verb

1. 1
   To win decisively.
2. 2
   To be very impressive.
3. 3
   To beat to a pulp; beat up

Interjection

1. 1
   Used to express happiness or a feeling of accomplishment.

Adjective

1. 1
   Rough, aggressive; powerful and successful.
2. 2
   Excellent, first-class.