Someone who automatically believes everything the government or its agents (e.g. the media) say. A synonym for a blind patriot. Someone who's programmed to be spoonfed and happily munch on the government's bullshit and doesn't know it--in fact, has grown to like it.
If you believe the government's official story of 9/11, you're more than likely a citizen.
If you've ever said things like "C'mon, why would the FBI make that up?" you're more than likely a citizen.