Also known as "the grade eight word", is the epic combination of five non-dictionary words, plus the optional prefix of "Epic" that are used quite frequently by people in today's society, more often teenagers. It's nickname ("The Grade Eight Word") originates from the location it was coined, a grade eight classroom. When someone thoroughly and utterly triumphs over the competition, this can be referred to as Epic Legit Uber Redonkulous Noob Pwnage.
Redonkulousaurus is an extension of the word "redonkulous," (popularized by the O.C.'s Seth Cohen) and serves to hyperbolize the already-supercharged fictional word. It was first used by Yula to describe her massive textbooks. Redonkulousaurus can be used as both a noun and adjective to describe something so utterly absurd, that it goes beyond the span of human imagination.
She has, like, $300 in her wallet. That's redonkulous.
Your mom is a friggin' REDONKULOUSAURUS. How many pizzas does she eat a day?