Referring to the worms in the movie Tremors series, The disgusting amount of excess skin the makes a dick look like the creature that stalked Kevin Bacon and crew. Basically an uncircumsized penis coming from parents who could care less about their kid living a normal life.
That graboid looks like a slim jim with the package on. That Graboid looks like an anteater. That Graboid looks like Patrick Stewart trying to poke his head through turleneck sweater. Man my parents must have hated me my dick looks like those Graboids. Gross look at his graboid!
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.