If it's the one that goes "oooooooooh SKC,SKC, SKC, SKCee" then I believe that's from a really really really old "Coke is it" Coca Cola ad.
Actually I have always assumed it came from Pop Goes the World by Men Without Hats. Our chant might actually predate 400 Degrees. Anyone know when the Cauldron adopted that one?
Oh. My bad, I read it wrong. I thought he was talking about the old standard Ooooooooh, KC Wiiiiz. To many songs starting with Ooooooh + stuff.