A male or female who places their head between a female's breasts and shakes back and forth while humming, producing a sound similar to a motorboat in water.
Since she wouldn't give oral sex to me, I motorboate her instead.
by ajs86 February 03, 2009

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the act of placing one's face between a woman's breasts and quickly shaking your head in a "no" like gesture left to right while emulating the sound of a motorboat.
friend A: "friend B, i haven't seen you in ages"!
friend B: "friend A you old motorboating son-of-a-bitch! how are you doing"?
by andytheicon April 19, 2009

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The act of putting one's face between a voluptuous pair of breasts while making a vibrating noise with one's lips and shaking one's head back and forth between breasts, simulating the sound a motorized boat would make upon water.
That chick's boobs are totally motorboatable.
by J No.5 August 17, 2010

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This is when you place you face straight into a females cleavage/breast and do a lip trill making the sound of a motor boat and shaking your head from side to side.

It usually tickles.
"Motor Boat me baby!"

Charlie smiled as he quickly shoved his face into the big breast and made a motor boat sound shaking his head.
by NikkehBabeh February 06, 2010

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Mainly a sex act performed as a favour to men who drive convertible drop top coupés by women who want to get a ride with the top down. The man rolls down the hard top roof of the car and proceeds to place his mouth and nose in between the woman´s exposed breasts, while rocking his head side to side very rapidly while making a , lip-vibrating "brrr" sound. The vibrations stimulates the nerves around the nipples making them rock hard and is usually an invitation for the woman to straddle him for sex inside the car.
Let me motorboat your huge tits
by GaryCarver May 11, 2016

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To be motorboated - when you go down on your girlfriend/misses and pout whilst blowing causing your lips to flap against your female friend pussy...aka motorboating
Open your legs love whilst i motorboat ya...
by moanerme August 19, 2014

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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.
guy leans into woman's breast and blows very hard...... then you have a motorboat
by houseboyt July 18, 2010

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