what's up

what's up

What's going on? What's happening? Often used as a greeting that does not require an answer. So what's up? How have you been? Well, what's up? Why are you so upset with me?

See also: up

What's up?

Inf. Hello. What is happening? What's up? How're you doing? Hey, Chuck! What's up?

what’s ˈup?

(informal)
1 what’s the matter?: What’s up with him? He looks furious.
2 (especially American English) what’s new?; what’s happening?: Hey Jo, what’s up?