Colloquial term for doing something negative or making a blunder; to screw up or commit an error.
プロジェクトの締め切りを忘れて大失敗をやらかした。
I completely messed up by forgetting the project's deadline.
酔って店の皿を割るなんて、またやらかしたね。
Breaking dishes at the restaurant while drunk—you've done it again.
新人が大事なデータを消してやらかしたので、フォローに追われた。
The new guy deleted important data and messed up, so we had to scramble to fix it.
Colloquially used to mean to eat up or drink (something), often implying greedily or quickly consuming it.
出されたケーキを一人で全部やらかしてしまった。
He ate all the cake that was served by himself.
ビールを三本一気にやらかしたから、すぐ顔が赤くなった。
He downed three beers in one go, so his face turned red immediately.