A MPV (multi purpose vehicle) that (unlike most of them) can actually cross muddy fields, ford every stream, climb every mountain etc.
Darrin's new Probe is a real riverboat but it has a shitty gearbox
by poodlewrestler August 05, 2005
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alludes to one who takes undue risk, wagering on the outcomes of inconsequential events and activities either for money or out of compulsion
Sylvester bet me that the next automobile to pass on Route 66 would be a turquoise Chevy Colorado. He is a riverboat gambler.
by HeadsIwinTailsulose March 05, 2015
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When a person goes in for a Cleveland Steamer and hits your belly instead... And goes on to churn the result like a Riverboat
Big gay Dennis went in for a tiajuana backpack, but lost his footing and ended up with a jelly belly which he turned into a Memphis Riverboat
by Cunbunal December 16, 2017
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Much like the motorboat, except you take a runny shit on the woman's chest first. You then proceed to motorboat her, and every few seconds you lift your head up and yell "Mark Twain!"
Shari wanted me to give her a Cleveland Steamer, but I gave her an extra treat when when I gave her a Mississippi Riverboat instead!
by Crablouse April 21, 2009
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When a couple decide to take their relationship further, with both parties shitting in a bathtub, and then one partner receives anal sex in the reverse cowgirl position. Like riding a boat.
Hey Babe, wanna take a trip on the Egyptian Riverboat?
by FatWillysSurfShack June 16, 2016
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When you are fucking a girl doggie style and you put your thumb in her ass to steer the direction of the motion
She was pulling away so i had to mississippi riverboat her ass back on track
by humandumpster May 10, 2010
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Akin to a Cleveland Steamer, the Mississippi Riverboat is accomplished by first getting the runs, then taking a liquid shit on the neck and chest of a woman, at which point the shit runs down her like a wide, muddy river
I had enchiladas for lunch, which turned the Cleveland Steamer I laid on her into a Mississippi Riverboat
by Milfadd May 03, 2011
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