When somebody intends to do something nice for you, like say holding an elevator or door, only to let go at the last minute making you look like a total twat!
Some guy snatched my purse today then this lovelly man tackled him to the ground and retrieved it. I was about to thank him when he took out my wallet and threw my purse in the bin, what an Unnoble Norman.
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.