Obviously, this is when 3 men engage in sex with no woman or additional parties.
Hey Steve, you comin' 'round tonight? Me and Jim are trying to set up a Three-Horned Rhinoceros....just need one more!
by BrightonWatch May 14, 2014
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Women that are very very fat that hit on you at the bar. So disgusting that not even the light switch can justify that one.
That fat girl at the end of the bar is a real three horn swamp rhino.
by gravytrain95 November 15, 2007
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