1 definition by Captain at the Helm
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 14, 2009