A mis-spoken version of "word up!" It is used to confirm or affirm something said in another sentence. Like approving of something another has said. Originated in Greenwich, CT by none other than Mr. Edward Larkin. It is now commonly used by Greenwich kids and laxers alike.
bro, im gonna go get some pork shu mai
WHADDUP!
by fishpig1 May 22, 2011
conjunction of the phrase, "what is up?"
by ill bill December 23, 2002
What people with immense amounts of swagger say when greeting people.
Guy: Whaddup

Girl: Oh my god he's got so much swagger *melts*
by Swagger is a way of life May 30, 2011

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