The male equivalent of the female Camel Toes (i.e. when a man wears the crotch of his pants so high and/or tight that the seam splits, strangles and displays his genitals)
Eww, that guy is rocking those pants so tight he's got a raging case of horse knuckles.
when two people get in a fight and one guyslaps the other and defeats him with instantly or with only barely any punches.
Person 1: Woah Dude! Did you see that? He just knocked him out with only two punches!
Person 2: Man that was a quick fight. That guy really has a horses knuckle!
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.