Used to call out someone when they're starting to sound like a crazy conspiracy theorist.
Comes from the classic King Of The Hill show, where Hank Hill would constantly call out his tinfoil hat friend Dale Gribble.
Johnny: "Hey Bobby, did you hear about the new X Box? It's got compatibility with blu-ray, downloadable content of old console games, no red ring of death, and gives you a handjob every time you win a game!"