what you doin

What you doin?
used not as a question but more as a statement as if to say "stop that now because you look like someone who doesn't understand socially acceptable behaviour" usually complimented with a sigh, a look to the floor/heavens and a shaking of the head YOUR FRIEND eats a burger and spills 70% of his ketchup on and around his body YOU say "What you doin?" and then walk off