The act of bobbing in the toilet for feces while someone is performing anal sex from behind.
This is one hell of a weird Halloween party, Mike! Did you see they're doing the Mississippi Mud Boat down by the bonfire?
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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?
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