Arlen Theory is a maxim first posited on Davis Wiki. The idea is that if a page doesn't exist, there is one surefire way to get fans of the topic to edit your wiki: Make a tiny, pithy entry talking smack about the the subject. Often as not, someone will come to "fix" the "vicious attacks", and the wiki will gain a new entry.
Use of Arlen Theory is not cool when you actually know something about the topic, but are too lazy to make the entry. Just edit the page already.