Short and quick way of saying "What are you" or "What do you" combined in one word, commonly used in conversations talking in second person.
Instant message conversation
Person 1:
dude whattaya doing?
Person 2:
nm, just chilling, you?
Person 1: whattaya mean
nm?
dude the party is tonight, right now, whattaya waiting for?
Person 2: will you stop saying that?
Person 1: whattaya mean?
Person 2: ...
Person 2 logs off
