The most retarded person you know.
Named for the small town in Central NY along route 206, called Downsville, with no direct offence meant to that wonderfulhamlet.
Elisha: Dad, I forgot to take the foil off the Ding-Dong again.
Keifer: What, are you running for Mayor of Downsville?
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.