a motorboat involves a girl with breasts large enough for a human head to fit between them. The owner of the head then proceeds to blow out of their mouth vibrating their lips. This action will make a sound very similar to a motorboat engine, hence the name.
by houseboyt July 19, 2010

by ale x January 15, 2006

Refers to a lady with ample breasts, or ample everything, whose physique built to perform a motorboat would be an easy task. The motorboating may be done anywhere on the corpus where one can press the face in between any skinfolds, 'as long as the cheeks are warmed'.
Before Oprah Winfrey lost all that weight she was extremely motorboatable. Now she still retains some motorboatability, but only of the more conventional variety.
by Captain Stubing July 14, 2009

by Bb dre November 19, 2019

by Ackack August 10, 2019

While performing oral sex on a girl, flap your lips together on her clit, thus imitating the sound of a motorboat. She'll love you forever.
by womanizer June 18, 2006

While performing oral sex on a girl, flap your lips together on her clit, thus imitating the sound of a motorboat. She'll love you forever.
by istef July 06, 2008
