あっちっちゃう
acchicchau

Godan Verb (u)
Interjection

The completive aspect (contracted form) - indicates completion or regret of あっちゃ

1. It's a bit complex, as it's a Kansai dialect contraction. Here are the meanings:; ; Did (it) get small.; It shrank.; (I) messed up.; (I) failed.

Completed Action
Colloquial