The skin abrasion acquired when one chooses to partake in any of the Mario Party Games offered for N64 which require rapid friction between the joystick and the users palm; usually in a circular motion.
This can can also appear as a blister, and often painfully peels away over the following days.
"Woah, why is your hand all bandaged up?"
"Mario Palm. The Tug-O-War had me going bat shit crazy."