Ass Motorboating 

Verb. The act of violently shaking your face in between the cheeks of an amazing ass.

While I was coming out of that pool, I couldn't help but ass motorboating that big ass booty!

Ass Motorboating by Fat Ghandi January 2, 2012

Motorboating 

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.

Sherry was wearing a low-cut top and Mike approached her and started motorboating in her cleavage.

Motorboating by BMan01 November 27, 2005

Motorbiking 

A pornographic act describing getting a blowjob from a girl with pigtails - holding the pigtails in each hand and pulling her head in so that she gargles on your penis, making a sound like a motorbike.

Dude, that chick will go down on anyone, she is so hardcore she is in to motorbiking!

Motorbiking by Silverlynx July 9, 2012

motorboatin son of a bitch 

n; One who motorboats --
n; Term applied to one who puts there head in between a females breast, moves there head side to side makeing a motor boat sound.

I was one motorboatin son of a bitch last night.

Did you see the rack on that girl that I was motorboatin?

I was motorboatin that hot stripper last night.

motorboatin son of a bitch by autumn festival August 21, 2007

Motorbutting

When you draw nipples on her asscheeks and motorboat her ass.

"I'm so motorbutting you tonight."
"What the fuck is that? Is it another one of those weird Urban Dictionary sex things?"

Motorbutting by zephwynder June 13, 2018

Metrobating 

The act of masturbating while on board a Metro train or bus.

After smoking his meth the homeless man pulled out his junk and started metrobating in front of everyone without a care in the world.

Metrobating by beerdrinker247 April 6, 2023

Self-Motorbation 

The act of motorboating one's own breasts. See motorboat.

Homegirl's titties were so big she could TOTALLY perform self-motorbation!

Self-Motorbation by The Utco 4 June 5, 2011