Mud Fin 

Mud fin is when someone passes gas, emitting some fecal matter that gets flattened out between their butt cheeks, poking out of the crack like a shark fin.

Steve could tell that last flatulence gave him a mud fin.

Mud Fin by Lazy Reggie August 4, 2013

Georgia mud finger

1. The unfortunate digital anal infiltration one suffers at the hands of hillbillies.

On a roadtrip to Florida we broke down in the middle of nowhere. We got kidnapped by hicks. My friends are still missing but I escaped after getting the Georgia mud finger. My anus still aches.

Georgia mud finger by Matool13 August 27, 2011

Mudfinger 

The unfortunate result of ones finger breaking through toilet paper while wiping. Usually this is a result of inferior toilet paper.

Gus: Hey Peabody have you been working in the garden again? it looks like you got dirt under your nails.
Peabody: Geez errr that's just Mudfinger, Clarice needs to stop buying our tp at the five and dime, that shit is see-through.

Mudfinger by qochaka February 2, 2015

mississippi mudfinger 

Same as wet waldo. Sticking your hand down the back of someone's pants and violating their anal orifice with your finger.

The lights went out in the elevator, so I grabbed the girl next to me and slipped her the Mississippi Mudfinger.

mississippi mudfinger by Stan B. August 31, 2003