(noun) take a woman over, say, 275 pounds, 45-55 DDD or bigger chest, a roll under her bellybutton like a fullsize loaf of French or Italian bread, rolls in her crotch like a 3rd (and 4th) set of labia, a pad of fat on her mons, huge buttocks, and you can't really get half-way into her in ANY position because of fat keepin' you away from her vagina so's you can bearly get your "head" into it
Denise, you is one BIG woman ! You is a blubbderfuck to beat all blubberfucks. You' sure yo' ain't already 'bout to give birth ?
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.