The typical gauge of physical 'intimate' relations involves 4 bases. Change-Room Shit refers to all that nasty ass stuff that isn't properly represented by those bases. Such acts are usually given exotic names such as "The Portuguese Windmill" or "The Transylvanian See-Saw."
P1: Hey man, I walked into Pete's room by mistake while I was looking for Sanchez. He was hanging naked from the fan above 2 Scottish midgets and a sheep.
P2: Man, that's some change-room shit right there.
Mark: I'm thinking of telling Evgeny that Communism is overrated *shocked faces*
Adam: Mate, if you throw a shit into the room, you better be able to lock the door!
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.