너 뭐 돼?
neo mwo dwae?
Meaning
A sarcastic clapback meaning 'who do you think you are?' when someone acts self-important
상대가 근거 없이 잘난 척할 때 비꼬듯 쓰는 말, '너 뭐라도 되냐?'는 뜻
Example
갑자기 훈수두길래 '너 뭐 돼?'라고 받아쳤어.
They suddenly started giving unsolicited advice, so I hit back with 'who do you think you are?'