Cahoonas is the English derivative of ''cojones'' used in US and British slang to denote “boldness, manliness and courage” and popularised by iconic films such as Pulp Fiction and Britishmale underwear brand Cahoonas.
You'll need a huge pair of Cahoonas to go 3 rounds in the ring with that nutter.
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.