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 long line to the bathroom! I was doing the pissfidget so bad it looked like I was doing an imitation of Michael J Fox!
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.