(idiomatic) Used to add emphasis to “what” when beginning a question.

(US, idiomatic) Everything that is required.

Dated form of what's going on (“expression of concern, asking for an explanation”).

Alternative form of wha gwan

(humorous, euphemistic) An interjection to express surprise or amazement, typically in place of what the fuck.

That is nonsense; that is patently untrue.

(slang) What happened, is happening, or is going to happen? Why did something happen or is someone acting a certain way?

(slang) What's going on? What are you trying to pull? (said when one is suspicious of someone else)

(slang) What's going on? How are you doing? What's new with you?

Used to argue that something's name is arbitrary and does not give any information as to its qualities; the names of things do not affect what they really are.