This article is silly. Coming from a source other than the computer games, trading card game, novels, RPG, or manga, its content is not part of official Warcraftlore, but nevertheless has become part of the culture belonging to the World of Warcraft community.
Sickle (or "the ceiling cat of trade") is a warlock on the server Khadgar Europe, he is famous serverwide for constantly being in trade chat. He keeps a watchful eye on the trade channel, being quick to scold anyone who asks an ambigious question. His rival was seen to be Oxocubes (or "the basement cat of trade") who has not been seen in quite a while. Some fear for his safety.