The feeling you get when you think you've seen something on TV before, but it turns out you haven't. Similar to Deja Vu.
Howard: I've seen this episode of Jersey Shore before! Damn re-runs! Wait, Snooki is acting like a whore? Unheard of! So maybe i havent seen this before!
Timmy: you've got a bad case of Teja Vu! Oh, and you talk to yourself a lot.