身披麻袋以为自己东方不败
[shēn pī má dài yĭ wéi zì jĭ dōng fāng bù bài]
'Wearing Gunny Sack Believing I’m Invincible in the East.' A funny reference to the popular Chinese martial arts fiction where ‘Invincible in the East’ is a powerful female character, and the person using this username likely considers themself as confident in an unconventional way.