why you do dat

slang term used mostly by young black males and wanksta-ass crackas- used by such notable characters as Will Smith, on the Fresh Prince of Bel Air, Theo, on The Cosby Show, Eddie Murphy all the time, P-diddy, Snoop Dizzle...etc

Hey Man, why you do dat?
Whoa, how you do dat?
Why you gotta be like dat, man?