It's a loose term for a bunch of lunatics who believe they are not subject to government laws or taxes. They use fake license plates, do not have drivers licenses, send in fake magic coupons to pay their bills, and believe that signing in red ink at a 45 degree angle conveys special powers. They're an absolute trip and I highly recommend watching some YouTube videos of them being pulled over, they refuse to cooperate, yell repeatedly 'am I being detained ', and it almost always ends up with a window smash and dragging out of the car. It's endlessly entertaining.