What sky-divers yell when they jump out of an airplane at an altitude which is too low to allow their parachutes to open, but too high to keep the sky-divers from becoming the pizza sauce on an upside down parachute pizza.
As Scooter jumped out of the airplane 187feet above the ground, he yelled, "GeronimOUCH!"
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.