因为一无所有所以无所畏惧
[yīn wéi yī wú suŏ yŏu suŏ yĭ wú suŏ wèi jù]
'Nothing to lose So Not Afraid of Any Losses' is likely chosen to symbolize bravery. Someone using this nickname perhaps is experiencing hard times, but he still can face everything bravely and positively.