Often referred to as the pee pee dance, it is usually most evident when someone is trying to suppress the urge to go long after the initial onset of bladder pangs.
Man, that was a longline to the bathroom! I was doing the pissfidget so bad it looked like I was doing an imitation of Michael J Fox!
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"