When you load yourself onto a catapult, assume the 'Pike' dive position and fly into a women's vaginal canal. For optimal pleasure, the catapultee must have reached terminal velocity before entrance of the vagina.
"Ok, Truth! What's your favourite sex position?"
"The Pussypult! That's an easy one!"
"Isn't that physically impossible? And even if it wasn't, it'd be both expensive and fatal for both you and your partner?"
"Nah."
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.