One who watches the hit NBC show "Heroes" yet knows next to nothing about it.
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 A: "I think Adam Monroe is going to be Takezo Kensei, what do you think?"
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."