After taking a poop the average human, chooses to wipe the anus to remove any left over excrement. When in the wiping process if on discovers that fecal matter is left on a finger, he/she has been mud knuckled.
i had some taco bell yesturday, ive been crapping all day, sloppy ones too, i even got mud knuckle it was so bad.
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During anal sex , upon re-entry you bend your hard on and it looks like a bent thunb.
I got a Mud Knuckle while plowing some chick in the ass last night. Hurt like hell.