rankasaurus rex Share definition Flag a person or thing who/that is especially disgusting, rank, and/or grody "Whoa, that three month old cadaver that Chris is poking with a stick is rankasaurus rex!" rankasaurus rex by RICHARD, LIZZARD, AND SCHLOSS October 27, 2004 0 0 Get merch Get the rankasaurus rex mug. Buy Now — $32.95 See more merch