儀式 ぎしき っちゃう
gishiki hacchau

Godan Verb (ru)
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of 儀式張る

1. To have performed the ceremony; To have gone and performed the ceremony; (Regretful) I went ahead and did the ceremony.

Completed Action
Colloquial