On Monday's Colbert Report, Colbert coined the term "wikiality" (which, unlike truthiness, he gets to keep as his own invention). He used the term to describe how, when enough people believe something, it may as well be true, regardless of reality.
Specifically, the concept was that, because Wikipedia can be edited, if enough people edit it a certain way, the view expressed there will become the "truth" regardless of reality. He then "edited" two pages, The Colbert Report recurring elements and George Washington.