to fist a male or female anally.
guy 1: did you go on that date last night?
guy 2: sure did, we went back to hers, she even let me fudge knuckle her.
Piling a dump so high in a toilet that when you go to wipe your knuckles hit the pile causing your them to be covered in hot fudge.
After taking a massive dump and wiping, I hit the pile and got a fudge knuckle.
When a sexual partner is fisting the other partner in the anus, and fecal matter, or more appropriately, "fudge" is left on the knuckles of the fister.
"I don't much care for fisting Lucy because I always get fudge knuckled."
the crusty brown ring left on your digit when removed from a womens anus.
it wasn't until the morning when Biff realized exactly what had happened the night before, although his memory was cloudy,there was no denying the fudgeknuckle on his right thumb.
Knuckles shoved into somone's arse repeatedly until they have permanantly been fudged.
Devin couldnt believe that he was punched in the face by a guy with fudgeknuckles.