Is what you would call a dumb person, who's big as a tank, with a brain the size of a peanut, very trusting, but easily manipulated, has either a pet dog or hamster named Duckie, sees things a little different than the rest of us, and believes in Bigfoot, and sometimes goes by the name Cornbred.
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.