What's going on? How are you? A colloquial contraction of "what's up." Often used as a greeting that does not require an answer. Primarily heard in US. Hey, Brent, wusup? How have you been? Yo wusup! Haven't seen you in ages, bro!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
interrog. What’s up? Hey, man! Wassup?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.