Top Definition
When two fully erect men lay on their backs, scissor their legs together until their balls touch, and a woman mouts both penises allowing for simutaneous penitration of the anus and vagina.
"I'll tell you Michael, there is no one I would rather Vertical Rhinoceros my wife with."

"I agree, your smooth shaved balls rubbing against mine really add to the experience, John."
by the band of 5 April 05, 2014
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