Kareans: from Korean Karens especially in the K-Pop genre; negative netizens that make sport of criticizing Idols and entertainers on every aspect of their lives from looks to actions. People suffering from the abuse have gone so far as to self harm, totally withdraw from society or end their lives.
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.