The act of laying several highly-potent farts inside of a car just before someone you know is going to get in, leaving them with a surprise attack of fermented fart upon opening the door.
Bill, when I got back from the grocery store today, I left a Polish Assassin waiting in the car.. My girlfriend got in and threw up all over the dash!
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.