Sackstick is the adherence of the scrotum to one's thigh. Sackstick occurs when men are physically active or wearing confining pants. We always see women picking at their drawers when the elastic rides up on their asses, but when you see a guystop and do a double knee bend, he is rectifying a case of Sackstick.
I had been standing in line in the sun for an hour when I noticed I had a gnarly case of Sackstick. Time to detach!
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.