Lavigne penned this rocker with the Swedish producers Max Martin and Shellback. The lyrics find the singer expressing her gratitude for a special person in her life. As the tracks on Goodbye Lullaby were penned over a series of several years, it is unclear whether Avril is singing about her former husband Deryck Whibley, whom she divorced in 2009, or her new boyfriend Brody Jenner from The Hills.
Yasmin from Zichron, IsraelI think it's quite obvious she wrote it about Deryck. There's a lot of pictures of them drinking and partying. and Everyone knows she has a tattoo of a D in a heart on her arm, and he has an A "your name was on me and my name was on you". We can say that Deryck is kind of a rocker, for the line 'f--king crazy rock N' roll", but Brody isn't even involved with music, so it fits Deryck more. In the song, maybe it's just me, but she says "blacked out" and "you're the one to blame", and as I see it, it's Sum 41's songs name, Black Out and We're All to Blame. if all of that isn't a proof for Smile being about Deryck... than I don't know anything.