the act of wiping ones arse in the direction of the nutbag, hence covering the sack in poo
similar to mud flaps (feminine)
friend: hey joe, whats that smell?
mudbagger: sorry buddy, i just did some heavy mud bagging.
As a form of fore play one carrys around a quart sized zip-loc bag full of thier lovers poop.
Person 1: Why do you smell like a dirty booty?
Person 2: Oh, it's my Mississippi Mud Bag. I am in to that type of thing you see.
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When you are fucking someones butthole and shit spews out onto your nutsack.
I was with this girl last night, and she totally got mud on the bag.
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