Cuntasaurus Rex Share definition Flag When a woman is being overly cunt-y. Usually the few days premenstrual. Woman: "Don't even go there with me" Other: "Ew, you're being a Cuntasaurus Rex right now". Cuntasaurus Rex by Ltotheizzay March 8, 2009 0 0 Get merch Get the Cuntasaurus Rex mug. Buy Now — $32.95 See more merch