Trying to explain something to someone and no matter how well or how much you explain they just don't get it or refuse to get it.
"All the evidence shows there was no election fraud but trump supporters still won't believe, you can lead a fuckwit to logic but you can't make them think"
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.