A variety of the man slut species. The mentioning of menstration would not repel such a spiked up black haired male form. One to constantly injure, preferably intoxicated and usually wounded in the skull area yet will deny these actions with a "I walked into a door, lad" excuse. A 'caolers' loves a filthy ride and will reacts to such terms as "Ahhhhhh lad" and "Daaaaycent" A sound skin all the same..
Guy: "You're one is on the rag"
Caolers: "Back away lads.... she's mine"
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.