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.
by Johnny UCF August 31, 2010
"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..."
"This guy motorboated my ass last night like it was my tits and then he said something about a bayou..."
by imotorboatdownsouth March 25, 2009