ぶっ ころしちゃう
bukkoroshichau

Godan Verb (su)
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of ぶっ殺す

1. I'll kill (you/it).; I'm going to kill (you/it).; (I'll regret killing you/it.)

Completed Action
Colloquial