The act of someone walking in on you masturbating when you're cumming so you have to do the Cum Cutter and stop.
I was stroking it last night and my sister walked in so I had to pull the good ol' Cum Cutter. Needless to say, I can never look at my sister the same again.
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.