The knower. Fun loving go getter, who oozes life energy and extreme charm. A social celebrity, as people are drawn to his/her intelligent jokes like children to a candy shop. A successful person who is able to immediately see the core of things and cut unnecessary crap out. Multilayered and profoundly interesting person who won't pay much attention to dull people.
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.