1) The painful process of removal of multiple layers of flesh around the male genitals through the generation of copius amounts of sweat coupled with an extreme amount of friction.
2) New method of exfoliating the outer layers of the scrotum using one's personal sweat.
I sweat soo much last week when we went hiking that I think I got galled. "Damn, that looks like that hurts!"
"Remind me to never wear boxers again when we go hiking."
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.