It is a hair style. It means loose hair is hanging down in front of the forehead. Can you use Google Images? A Google Images search on the word "bangs" will explain it better than I can. When it is done intentionally, usually by women, it can look attractive. Here, it seems to be suggesting that this man just hadn't had a haircut and that it looked sloppy. Here are bangs on a woman: https://s-media-cache-ak0.pinimg.com/236x/88/df/39/88df392cf5887308677c5be0d040962c.jpg