A penis which is similar to that of a weasel's, in that it is extremely pink, slimy, and unsheathed in a manner much like a dog's penis. However, weasel penises rarely reach lengths of greater than 2 1/2 inches.
"Fuck you, you son of a bitch!" yelled Derek's girlfriend when he tried to touch her with his disgusting weasel penis.
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.