An expression of surprise and disbelief that is uttered when one is in a situation that is perceived to be rediculous or beyond belief. Usually said when a person assumes that they are being fooled or made the butt end of a practical joke; not wanting to face the facts of a real situation.
Originating from the TV show hosted by Ashton Kutcher
where he plays practical jokes on fellow celebrities deceiving them into accepting a crazy scenario or situation is real.
Jackass: dude, your house burned down and everyone you love is dead! Oh, and your girlfriend is cheating on you!
Pedro: What?! Am I being punk'd?