The constant fear that someone will ask "What are you listening to?" at the very moment that you're listing to something that you like, and that is probably good...but would be considered very unhip, therefore rendering you pegged as a dork.
Billy, walking the school hallway jamming to "Rhinestone Cowboy" by Glen Campbell on his iPod, his iPodaphobia at an all-time high, hopes nobody asks what he's listening to.
Hotpants McHottie: "Hey Billy! What are you listening to?"
Billy: "Oh...er....uh....just a little Black Hole Sun by Soundgarden. Totally rockin!"