Top Definition
The last living dinosaur, its footprints have been spotted on this earth for over 87 million years. The McCainosaurus has through the course of its evolution developed into a contradictory asshole type of dinosaur, often seen nowadays on C-SPAN making incoherent dinosaur noises.
Person #1: Did you hear McCainosaurus' interview?

Person #2: Yes, but I couldn't make out most of it due to the constant "ARRRRGHAHAAAAAAAAAAAAHHHHHHHHGGRs".
by CanYouPleaseRepeatThat? January 11, 2011

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