This is a fine sexual act where you fart inside of your partner's anus. Then, your partner positions their anus over your mouth and unloads your special surprise directly in your mouth.
Trevor: Man! Angela's breath is horrific! What's the deal?!
Mark: She got herself hooked on Peruvian Panflutes bud...
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.