A sexual experience where 6 or more men have sex with one another.
Hey, me and my frat buddy's went on a Mississippi boat ride the other weekend.
by mr_boatride January 5, 2010
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5 or more men performing anal sex in-line with each other. Extra points if it's incestuous.
Hey Tom, the guys wanna know if you're in for a Mississippi Mud Boat Ride this weekend?
by Big Ern Mccracken February 17, 2020
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