Guy 1: Dude, the Bible is all out in favor of spanking in the bedroom! Matthew 5:39 tells us that, if someone spanks you on one butt cheek, you're to present the other one for spanking as well.
Guy 2: Jerkaverse! Did you even read the verse? There's no mention of a butt, nor is there any mention of foreplay.
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.