When one takes a poo in a public place usually for comic value or on an enemy's property as a form of revenge, leaving the victem with a warm, smelly, steamy, some times wet deposit depending on what the donor had for dinner the night previous to the insodent.
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.