An expression used when the absolute most terriblething has happened to someone and the realization that you or anybody else cant do a damned thing about it.
You ask a guy to help you with your car because its having problems. He gets in the car after fixing it and takes off with your wallet, phone, and laptop inside. You yell for help, but soon realize that there is no one around. So the only thing to do is silently utter to yourself, Wellfuck.
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.