Someone that is not attracted to anything, be it man or woman. Emos often claim to be zsexual, though are most likely lying.
Straight Friend: Hey, check out that hot chick over there!
Zsexual: I'm not interested in girls...
Gay Friend: Then what about that cute guy?
Zsexual: I don't like guys either.
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.