When one of your friends gets loaded, you pull down his pants in back and lay a hotdog in his buttcrack. It is usually garnished with ketchup and mustard.
When Steve passes out, we're totally going to ballpark frank him. When he wakes up, he is gonna be PISSED.
When you screw a girl that is on her period, pull out, and apply mustard to your penis and reinsert.
Guy 1: Hey, how was your night last night with your girlfriend?
Guy 2: Awesome! Fucking Ballpark Franked her!
Guy 1: Wow, really?
Guy 2: AWWWWW YEAAAHHH
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.