This is rare, but can happen if your not carefull. This is when a girl has some dude cum on her tits and you go in for the MotorBoat. You come up with a face full on cum. Kinda looks like there is water in the oil since its so white. Oh wait a sec it's cum on your face dumb shit.
by Mr. Dirthole August 7, 2012

To massage a woman's right breast clockwise and her left breast counterclockwise while one motorboats said woman
by Skoth December 9, 2008

The Smelly Motorboat is the less recommended alternative to motorboat. You simply place your face inbetween the well endowed ass cheeks of the he or she and shake your head rapidly side to side while yelling, thus causing the sound effect of a motorboat... although a smelly one.
Guy 1: dude my girlfriend has no rack
Guy 2; looks like your gonna have to go for a Smelly Motorboat
Guy 2; looks like your gonna have to go for a Smelly Motorboat
by Jarlus December 9, 2008

A Motorboat Dick is another word referring to a vibrator or any hand-held device that you use to play with your pussy.
by o visit really? November 22, 2018

by Suck My Dig July 20, 2017

When you are doing the sex with a girl and she gets on top and you motorboat her tits. brrrrbrrrrbrrrbrrrrpppppppp.
by brrrrrrbrbrnrbrrbrbrrrrrr June 20, 2016

When a guy farts during sexual intercourse and it vibrates the penis inside the vagina causing a vibrating effect.
by mj1987 May 7, 2016
