kick-ass

Or kick·ass

[kik-as]

adjective

Slang.

1. strikingly or overwhelmingly tough, aggressive, powerful, or effective.

   He finally built himself a kick-ass computer.

kick ass

verb

1. to be impressive, esp in a forceful way

   pop music that kicks ass

adjective

1. forceful, aggressive, and impressive

Word History and Origins

Origin of kick ass¹

kick + -ass

Idioms and Phrases

Also, kick butt. Punish or discipline harshly; also, defeat soundly. For example, That foreman's furious; he's going to kick ass before the day is over, or Our team is out to kick butt today. [Vulgar slang; 1940s]