いってらっしゃいちゃう
行ってらっしゃいちゃう
itte rasshaichau

Godan Verb (u)
Interjection

The completive aspect (contracted form) - indicates completion or regret of いってらっしゃい

1. Going and returning, but…; (Implies something went wrong with the return)

Completed Action
Colloquial
Usually Written in Kana