A Woeoth is a person who doesn't know what the word "Woeoth" means. So basically, it's a club for people who know what it means, so they can make fun of people who don't.
The true meaning of Woeoth has been long forgotten, all we know is that it's really funny when people don't know what it means. Now you do! Thus making you not a Woeoth. Congratulations!
Jill: Hey, knock it off with those nonsense words!
Jack: *snickers to himself, knowing that it's a real word... sort of*