Originally said by Butthead to Beavis, the phrase is said when you are watching someting really HOT that causes you a strong erection, and then your friend tell you something totally disguasting or stupid, and that causes your erection to disappear immediatly.
.....
Beavis: Yeah... and *poop*.
Butthead: What did you say?!
Beavis: I said "poop!".
Butthead: Beavis... you just sank my boner to the ground.
I was watching an awesome music video showing hot chicks in bikinis shaking their booties. And than this ugly, black, fat rapper appeared and it sank my boner to the ground!
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.