It means the activity of putting one's face between a woman's breasts, and rocking turning one's head rapidly from side to side while making a noise like a motorboat.
"Put your head between her tits and go bbl bbl bbl bbl bbl..."
"Put your head between her tits and go bbl bbl bbl bbl bbl..."
by corgilover18 November 14, 2018
"This girl was in my room and I couldn't take it anymore so I motorboated her. After the motorboating she left."
by A Bobby August 28, 2006
by DGAFinc. December 02, 2006
The placement of one's face, specifically the mouth, into the area between a well-endowed woman's breasts, followed by a rapid shaking of the face in a side-to-side motion accompanied by yelling. The resulting sound that is created sounds similar to an outboard boat motor.
by BMan01 November 25, 2005
by Urban Dictionary October 26, 2007
We thought Michael was getting lucky in his room, but it turned out he was just motorboating by himself.
by BobbyHi11 December 10, 2014
by Kawaii Koneko Ichigo April 07, 2009