A prehistoric beast known to have survived the great extinction by fucking everything such as trees, T - rex's, rabid cows, feral cats, and your friend named john. Known to swallow whole bananas in time of great hunger. Does not breathe air. Usually is a bitch.
Dude 1: Yo look there's a skankosaurus
Dude 2: Na man thats just danielle
n. a peculiar melange of the words skank and tyrannosaurus, implying that the recipient of the comment is, as tyrannosaurus was the entitled the "tyrant lizard", the king/queen of all skanks.
"Latoiya is such a skankosaurus. It was bad enough that the biotch had to sleep with my boo, but now my grandpa! I hope that slut gets herpes!"