A Tech Girl is a girl who likes to spend a lot of her time studying hard and fixing bits of broken computer back together again. In other words, she is a bit like a girl version of a nerd.
Boy 1: "That girl over there aces all her tests."
Boy 2: "Yeah? Does she fix pcs as well?"
Boy 1: "Yeah, she does. She's such a Tech Girl"
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.