Like it or not, "Wooooo!" started with the Nature Boy Ric Flair in the late 80s. It is now a staple with the Carolina Hurricanes and Charlotte Knights (AAA baseball). Sounds more "natural" at these venues IMO.
Better than what Clemson does with their woo. It's really not very becoming and sounds like what a seven year old girl would say after being challenged on the playground. I cringe when I here it. Something like woo-hoo woo-hoo-hoo-hoo. Horrible.