Or someone who wants to be cool and tries to pretend that they watch it and when asked who they like the most or what they think will happen next the don't know what to say.
Person B: "Who's Adam Monroe? I don't know who the other guy is either."
Person A: "They were just talking about them you r-tard!"
Person B: "Oh, were they really?"
Person A: "Dude, you're such a Heroes-tard."