noun. The primordial dumbfuck from which we are descended.
Real citation: "omg Xplod. Looks like Dino's are still walking around ay Xplod u dumbfuckosaurus."
(Oct 28, 2003, http://www.nzgames.com/forums/showthread.php?t=53165&pp=40&highlight=dinosaurs)
Made-up citation: "The dumbfuckosaurus is strong and roams the earth in marauding hordes. Even a meteor couldn't wipe out this shit-for-brains, say meteorologists."