verb. (inner-tubing) Inner-tub-ing- When a man holds open his butt hole while another man shits down it.
This one time Hitler and I were fish hooking on a boat, while also getting kinky with some worms, and we began innertubing with him doing it down me.
by Me45847383974 September 24, 2010
The act of putting your penis behind the knee of a girl and have the girl wrap around your body.
i went to her house and we went inner tubing. we had a great time
by theblackguyatlunch April 13, 2011