The act of desecrating a wikipedia page with false information, thereby fucking over anybody who decides to use information from that page within the near future. In rare instances, Wikigraffiti can go unnoticed for weeks or months at a time. This act can be quite fun, and there are games based on it as well.

Noun - When in an instance when you need to prove someone wrong, just pull some Wikigraffiti and you'll be safe.

Verb - It is pretty typical of people to Wikigraffiti the "George Washington" page on Wikipedia.

When you eat dirt for the first time and leave your family to build a shack in the woods