1. : the part female, part monster, that all women turn into at that special time of month known as PMS.
2. : a woman susceptable to be hyper-emotional including sudden mood swings and irrational behavior.
eg.1 When Ted was verbally assaulted for no apparent reason by his sister Sarah, he realised he was no longer dealing with a woman, but that of a Ragasaur.
eg.2 (plural) Upon returning home from a boys night out, the gents were ambushed by a ravenous pack of Ragasaurs, previously known as their wives.
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.