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wussupunknown
Contraction of the greeting "What's up?" which is a contraction of "What is up?" If you're really pressed for time, greet someone with a "sup"?. In any case, the greeter is rhetorically asking you what is going on in your life. Roughly synonymous with hello but less hip.
Hipster1: Wussup?
Hipster2: Nuttin'.
Hipster1: Word.
Hipster2: Word is bond.
by Edward January 06, 2004