Wiktionary
kick butt
alt. (context slang idiomatic English) To be impressive; to be decisively good or pleasant. vb. (context slang idiomatic English) To be impressive; to be decisively good or pleasant.
Usage examples of "kick butt".
Unless you've got a better idea, maybe it's time to call my boss and let the DBA come on out and kick butt.
Recalling her previous triumph over the egg-laying alien queen, Geneva would smash through the door without hesitation, and kick butt.
West was proud to work for a woman who looked so sharp and had good legs, and was decent to people and plants, and could still kick butt with the best of them.
No matter how many times he saw her kick butt, he never got tired of it.