Dictionary.com
Thesaurus.com

wassup

American  
[wuhs-uhp] / ˈwʌsˈʌp /
Or whassup or wussup

interjection

Slang.
  1. what’s going on or happening; what’s up (used as a greeting).


wassup British  
/ wɒˈsʌp /
  1. slang what is happening?

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of wassup

First recorded in 1900–05; pronunciation alteration of what’s up (in the same sense)

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“When I get in there,” she said, running, again, out of the car, “I’m literally gonna be like, ‘Yo, wassup, Mayor?

From New York Times • Aug. 7, 2015

Dekline shoes and Dekline team, everybody at grind king, everybody at Ezekiel- wassup speed!, my homie Rod and his boys in Hawaii, Val Surf, FTC, Diamond and everyone at Empire-go damn dumb!,

From Time Magazine Archive