1. To give a blank look when talking to someone, like a deer caught in the headlights of an oncoming vehicle.
2. To say something that comes totally out of nowhere.
3. To ask a question that inevitably has no answer.
A. Me: Hey man, why did you slash your own tires
Me: Say something
B. Williams: what did you think of that?
Me: What did I think of what?
Williams: Don't play dumb with me.
C. See B above