When a law, ordinance or regulation passed for the purposes of suppressing a minority or minorities is used against the very people who sought the regulation. (Ex. section 1361 Title 18 June2020)
“Man that Trump law about the Black Lives Matter protests just totally Blackfired on those Neo-Nazis who stormed the Capitol Building!”
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.