What is. / What has. / What does.

For what purpose. / (colloquial) For what reason; why.

(idiomatic, colloquial, usually with "give someone") An unspecified punishment or rebuke

(idiomatic) So what? Who cares? Expresses disinterest, disregard or lack of concern.

(idiomatic) Owing to; because of; as a result of.

(literally, sometimes philosophical) This thing has its own distinct nature; this thing is itself.

(informal) A speculation as to what might have happened if something else had happened earlier.

(informal) To speculate about the consequences of something that could have happened.

(idiomatic) Or something else; allows for the existence of an unexpressed alternative to what was said.

Used to introduce a suggestion or proposal for a future event. / Used to introduce a speculation about a future event.