When you're happily drinking with friends and rest your eyes for a second at the local pub, and suddenly wake up to find yourself sprawled across the steps of your house or in some alley in the middle of nowhere, then you my friend have just taken a ride in the beer taxi.
BeerTaxi: ferrying blokes to random ass places since 10,000 BC.
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.