Top Definition
a genetically engineered gerbil with an opossum tail for easy retrieval from the ass.
"No more emergency room visits for me, I have an operbil!"
"Have you seen Brantleys new pet? Its one of them there new critters called an operbil!"
"Too bad Richard Gere didnt have an operbil way back when!"
by T the ODD October 04, 2008
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