(vulgar) Used to express astonishment, shock, incredulity, or disbelief (as a shortened form of expressions such as "What the fuck is going on?", "...are you doing?", "…is this?" "…is it" or "...is that?").

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

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

(colloquial, set phrase, rhetorical question, often sarcastic) What a surprise; guess what? / Used other than figuratively or idiomatically: see what, do, you, know.

(colloquial) What is wrong? Why is this happening? / (colloquial, possibly dated) What is happening? What is going on? / (colloquial) How are you?

(idiomatic) furthermore, or in addition, moreover.

(set phrase) A remark on the unfortunate, exceptional, or unusual nature of somebody's death.

A species of baleen whale (Megaptera novaeangliae).

A whale (Physeter catodon, syn. Physeter macrocephalus), the largest of the toothed whales. / Any whale in the superfamily Physeteroidea, which also includes the small whales of genus Kogia.

(idiomatic) To enjoy oneself greatly.