when a female has a rather wrinkly vagina or (pussy) and it is always moist. sometimes there is irregular extreme amounts of discharge that flood the panties. often a cunasoris rex is an ugly preppy girl with a hairy or razerburned rectum
you want to be rude to someone without being to harsh, then simply go for 'cuntasorusrex' simply means they are a c*nt which should have beendestroyed with the rest of the dinosaurs.
This is a person, not just women, who i being such an annoying cuntto the point where you need a bigger and better word to describe them. Like dinosaur plus cunt.