A teenage girl (or a guy if he's gay) who likes a band based on their looks, not their actual talent. They typically post crap on message boards and in chats about the band about how the members are so hot.
"LIEK OMFG!!!1 CHAZ FRUM LINKIN PARK IZ SOOOOOOOOOOOOOOO HOT!!!!111 I WANT 2 SEE HIM NAKED!!!!1 I WANT 2 FUCK HIM N HAV ALL HIS BABYS!!!11"