expression, godan verb (-u)
screw up; goof; do something regrettable
Colloquial, often self-deprecating or regretful. Used when the speaker acknowledges a mistake or an action they wish they hadn't done.
またやっちまった。
I screwed up again.
ついカッとなってやっちまった。
I lost my temper and did something I regret.
expression, godan verb (-u)
Colloquial, often used in rough or tough-guy speech. Implies physically attacking or defeating someone.
あいつをやっちまえ。
Take that guy out.
昨日のケンカで相手をやっちまった。
I beat the other guy up in yesterday's fight.