つぶしちゃう
fumitsubushichau

Godan Verb (su)
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of 踏み潰す

1. Stepping on (and crushing); Having stepped on (and crushed); I stepped on (and crushed); I'll step on (and crush)

Completed Action
Colloquial