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1.
the act of a woman taking off her bra and wiggling her tits in your face.
this is much better than a regular motorboat, because y'aint gotta do shit!
"dude this chick at the bar totally reverse motorboated me last night."
"Reverse motorboat? hows that one work?"
"Its where she takes off her bra and wiggles her tits all over your face"
by ARMY MAN EASY December 04, 2008
 
2.
When a woman happens upon her man having a wank while lying on his back, she disrobes and straddles him in a similar fashion to the reverse cowgirl. However, unlike the sexual position, the woman nestles her man's ball sack between her butt cheeks and proceeds to fart on them as many times as possible, creating a wonderful vibration for him and audibly resembling the engine of a motorboat.
Linda found Jack wanking in their bedroom and offered him a nice reverse motorboat. Jack happily accepted.
by Captain at the Helm April 13, 2009
 
3.
The act where one presses face against a guys genitals and rocking one's head side to side between the balls very rapidly while making a vigorous, lip-vibrating "brrr" sound.
I would totally Reverse Motorboat the shit out of him.
by Tha Ruzz November 27, 2009