When a woman covers your nose with her vagina, and puts her butt hole to your mouth. She then lets out a nasty fart, thus filling your lungs with dirty air. This was originated by a girl name Jenny, thus the name.
I got the nastiest dirty Jenny last night, I had to pick the chunks out of my teeth.
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.