A man who frequents restaurant bars with a t-shirt that has the word "slutbanger" on it. This man can and will bang any slut that makes eye contact with him. His hands, while delicate enough to roll a perfect pie at his mon-fri job at pizza hut, can be deadly enough to "wipe the floor with you." His 6'2 220 lb frame is a force to be reckoned with.
Jim: don't bring your girl to the bar tonight bob, slutbanger is going to be there.
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.