A smasherteer is someone who has all the qualities needed to smash it in, such as the ability to talk absolute shite all nightlong, to drink anything that is put in front of them, being absolutely ruthless with the opposite sex and convincing them everything you say is true.
Fuck, you drank 4 hot Dostavs, 6 Avi's lovers and 9 Smash it ins last night, awesome smasherteering!
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.