Top definition
when a couple take an inter tube into a lake or body of water and you swim up through the center of the tube with your arms around the tube and the girl pulls her bikini to the side so you can have sex both leaning aginst the tube for better pinatration
we were tube fuckin at lake haveascrew and when we got back to shore another couple said can we barrow that inter tube and 10 minutes later 15 couples in tubes in the water fuckin
by the randyman January 15, 2010
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