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Soemthing that is so utterly ridiculous - and large - that it makes you laugh like a donkey

alt. definition: a rhino mounting a donkey. It just doesn't happen! (however, see "liger")
Two fat people and the kama sutra. "That shit is rhinodonkulous! It's like watching two beached whales flop back to the sea!"
by Notorious M.c.G. March 22, 2009