The act of sticking your face between a pair of butt cheeks and shaking your head violently while making noices that resemble a moter boat.
Orlando Bloom was a sexy elf, I would love to watch a documentary about ants with him and then give him a dirty motorboat after we eat eggplant salad.
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The act of motorboat-ing an attractive woman's ass instead of her breasts.
"Man she's got a great ass. I'd love give her the Dirty Bayou Motorboat"
"This guy motorboated my ass last night like it was my tits and then he said something about a bayou..."