Top Definition
A mythical cross between a rapper and rhino. Contrary to popular opinion, he is domesticated and even trained, he has fly beats and often carries birds on his back. He both has a horn and is constantly sexually aroused. He is not successful in rap, not making records or rhymes or getting paid for them, which means they don't get played. He is also not sexually active. He enjoys going to his grandmother's tea parties. Contrast with the somewhat more successful Hiphopopotamus.
'I'm the motherflippin' Rhymenoceros!'
by kldickson March 04, 2009

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