たまっちゃう
堪っちゃう
tamacchau

Godan Verb (ru)
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of たまる

1. To be able to handle; To be up to the task; To mess up; To fail; To be ruined

Completed Action
Colloquial
Usually Written in Kana