A sexual act wherein the man performing the helicopter dick maneuver becomes entranced by his majesty and completely forgets about the girl in the room.
Shawn: yo man did you and Abby get it on last night?
Bryan: nah man, we started undressing and the-
Shawn: Filabuster Flopper?
Bryan: Filabuster Flopper.
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.