Slang for what's that.
Usually stated like the fools from the Budweiser commericals that say "Wassup."
Stacy: "Crap on you, you ignaramous insuffering panda bear."
Mike: "WaZZaT j00 say?!?"
what is/was that
a: We running a little late.
b: Wazzat? I wasn't listening. (example of wazzat)