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1. What's going on? What's happening? So, what's up with Terry? He seems off lately. Well, what's up? Why are you so upset with me?
2. How are you? How are things? (Used as a greeting that doesn't require an answer.) Hey, Tom, what's up? Long time no see! A: "Hi Sarah!" B: "What's up, Janet!"
See also: up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Inf. Hello. What is happening? What's up? How're you doing? Hey, Chuck! What's up?
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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?
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