When you nut in a girl and she shoots the nut back at you
"I realized my mistake when I didn't pull out and she hit me with the Baby Blaster."; "Equally sexy, I can suck water from the bath with my vagina then lift it out and shoot water out of it like a pistol! Pew pew! BABY BLASTER"
After days of his wife's pleading to have another child so McGruff would have someone to play with, Jason grabbed a 30-pack out of the fridge, picked up the keys to his tractor, and told his wife to go get a turkey baster baby.
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.