In the episode in question, who can stay naked the longest, Kenny wins by tricking Spenny (specifically, Kenny terrorizes Spenny into hiding in the basement and while Spenny does Kenny goes around changing the time on all the clocks so Spenny thinks the competition ended 5 minutes before it did and he puts on clothes early), and has Spenny go up and down the street in Toronto proclaiming he has a small wee wee as a humiliation.
Kenny cheats. Kenny wins. Kenny humiliates us.
It - is - over.