A person who pretends to like the same bands & artists that your friends like just to get accepted into your crowd & mingle with you, but when they are alone, they listen only to their old shameful bullshit music in the closet to avoid embarrassment.
"Cornelius is a Closet Bandit! He pretended to like our favorite bands & dress up cool just to hang with us. He just pretends to like Marilyn Manson. This whole time, he's been flailing his arms and dancing to Peyton Parrish in the closet!"