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The lazy rhinoceros is when the male companion passes out during sex, and the horny female companion straps a dildo to said male's forehead and proceeds to fuck the shit out of it.
Quinton - "Dude, I blacked out mid-sex last night."
Chris - "Yeah, I know. Helen gave you the Lazy Rhinoceros!"
by BigHarryPeters September 04, 2011