The Rapebeard is a thick beard, much like a chin strap, except thicker. The thickness of the Rapebeard allows the rapist to perform a silent rape, because the beard muffles out the screams the victim may give.
Phil: Where's Dan?
Chris: Probably putting his Rapebeard to use.
Phil: If only we could hear the screams...
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.