What is a chain banger?

Just started researching this myself, due to a little girls picture having the title "chain banger" across the bottom of it. I was concerned. What I found right away is that "Chain Banger" is a term used in the video game Crackdown. It is said to be an achievement and is when the player gets gets 100 explosions within one minute. Made me feel a little better about her picture title!! :)