One Direction - Teenage Dirtbag Lyrics Meaning

This song is actually Wheatus, but one direction sang it well. Now it's about a girl named Noelle, and this boy is obviously in love with her. The problem is she has a boyfriend... Who is a dick. Then they go to prom, and she comes and talks to him and whatnot, then he invites her to see iron maiden with him. She accepts and he says " I'm just a teenage dirtbag baby, like you." Saying, they aren't so different after all.