When one person is to a point of being so tired, that there mind is half way between dream world and reality, causing them to possibly see things that aren’t there or say things they normally wouldn't
"Hey, why did you say you wanted to eat my cat last night?"
"Sorry, I didn't mean it, I was tired high... couldn't get much sleep."
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.