When a person screws something up, usually playing golf and your ball is lost in the "cabbage" or the thick of the woods. However this term can be applied to any situation involving a screw up.
Ex: Eh Ray ya really dicked er in the cabbage on that one
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.