(informal) An informal greeting.

(idiomatic) The latest developments in a particular situation or a person's life.

(informal) An informal greeting asking the other person what has recently happened in their life. A typical response might be "Not much; you?". The greeting is not always literal and may just be used to say hello.

(idiomatic) An informal greeting. / (idiomatic) Expression of concern, asking for an explanation

An informal greeting.

Alternative form of what time is it

Used other than figuratively or idiomatically: see what, is, the, difference. / (idiomatic) The difference does not matter; so what?

(slang) what's happening?; what's up? (a greeting)

(colloquial, often with a following present participle or infinitive expression) Used to indicate that a specified or implied action cannot succeed or offers no advantage if successful

(slang) What’s going on with you?