たらしこんじゃう
たらし込んじゃう
tarashikonja u

Godan Verb (mu)
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of たらしこむ

1. To let [something/someone] fall into [a state]; To ruin [something/someone]; To spoil [something/someone]

Completed Action
Colloquial
Usually Written in Kana