Backgina- Making a vagina by using your back muscles. By straightening your arms and moving them back to form a “Jesus” on the cross shape, you turn your upper back into a vagina.
“Hey Dave, did you see Rose stretching the other day? She did a Jesus pose whilst warming up and made a wicked backgina”
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.