When one is using the public washroom and in the process of excreting, lets out a loud, resounding, fart. Followed by a loud echo in the room, it results in extreme embarrassment for whomever is present.
Friend 1: "Hey, can I borrow your lip chap?"
Friend 2: "No problem, here you go."
*Interrupted by a loud, bodily noise*
Friend 2: "Holy crap, I can't believe that just happened!"
Friend 1: "You're telling me. That was a huge Toilet-Bowl-Ringer if I've ever heard one!"
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.