Pop junkie
Someone who immediately falls in love with a song that's played on a pop radio station/MTV, and for that reason only. They then download that song, set it as their ringtone, and overplay it at parties and/or in general until the next song comes out. Typically a 15 year old white girl.
Sarah's party was fun except for that pop junkie who kept playing "boom boom pow" over and over. That song was stuck in my head for hours