Originally used to describe the pallor which developed amongst inveterate D&D players, it widened to include denizens of any stripe who resided in the basement of their parents. Most recently it is used to describe the complexion of any video game addict.
1978: His dungeon tan is proof enough that he is an indestructible wizard.
1998: "Yo, ghost boy ! Nice dungeon tan. I see that you gave up POGs for Magic Cards !"
2008: PlayStation and Xbox gave him the dungeon tan. But at least Wii gives him some muscle tone.
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.