This is the 14562nd most frequent Korean word.
뭐냐
"What is it?"
The word '뭐냐' is used here to ask about the identity or purpose of an object, generally showing curiosity or seeking information.
이거 뭐냐?
What is this?
In this context, '뭐냐' is questioning behavior or reasoning behind someone's sudden emotion or reaction, indicating confusion.
갑자기 왜 그렇게 화내고 뭐냐?
Why suddenly did you get angry like that, what is this?
Here, '뭐냐' is used to critically ask about someone's actions, expressing disapproval or request for clarification.