まとまっちゃう
纏まっちゃう
matomacchau

Godan Verb (ru)
Godan Verb (u)

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

1. get tangled up; get wrapped up; get caught (in something); regret (doing something)

Completed Action
Colloquial
Usually Written in Kana