A variation of "Drop off the Cosby kids at the pool", whereas dropping off the Cosby kids and the pool means having diarrhea.
*storms for the bathroom* "OUT OF MY WAY!"
"Why? Do you have to drop off the Cosby kids at the pool?"
"Worse. I have to drop off the Cosby kids AND the pool!"
"Uh...okay, then. Good luck with that."
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.