a sexual act in which one partner is upside (via handstand or being held upside down by another) and projectile diarrheas in the air, like a volcano erupting, while the other partner awaits below to have the diarrhea rain upon them like hot lava
damn, that nasty hoe tried to get me to go volcanoing with her last night, disgusting!
When you open a woman/mans prolapsed asshole and fill it with a flammable substance like gasoline or lighter fluid. You then light the substance on fire and watch the anal cavity explode in a firy plume of shit and possibly semen.
Adrian: Yo what are you doing tonight?
Steven: prolly gonna be volcanoing my girl tbh.
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.