expression
what's up with ...?; what the hell?; what was that?
Colloquial expression used to express surprise, irritation, or demand for explanation. Often rhetorical or emphatic. Can be directed at a situation or a person's behavior.
急に呼び出して、何なの？
Calling me out suddenly, what's up with that?
さっきの音、何なの？
What was that sound just now?