The condensed or shortened version of the words "what did you".
(also see whacha)
No.2 :: Nuthin much, jus sat 'round the crib and chilled with a six-pack. Wudya do?
No.1 :: I caught that new flick at the movies?
No.2 :: Wudya think?
No.1 :: Waz pretty cool, you should catch it sumtime.
No.2 :: Mayb next week.