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2.
The medium- to large-sized breasts of a woman when clothed by a low cut garment that only extends superiorly as far as the widest point of her bust.

Can predispose the bearer to nipple slip.
"So I'm just trying to work, and in she walks with these motor boaters, all cooing and jiggling, and I about f*!cking lost my mind!"
by atajack August 05, 2009
 
1.
A drinking team from the Las Vegas Valley. Originated from the depths of Lake Mead. Known to attend UNLV Rebel Basketball and Football games. Always taking applications. Required initiation is to motorboat gingers or amys.
I'm bored, I wonder what the Motorboaters are doing?
by UNLVrunrebs August 11, 2011