One of us

From Superdickery

A catchphrase used when someone says or does something that is exceptionally nerdy in a certain topic, particularly if that person has not been interested or even openly against that topic in the past.

Taken from the movie "Freaks" apparently, although Drink who was the first to use the term on the Superdickery forums took it from the Clerks cartoon, who took it from "Freaks".