不美不萌不倾城的小女子
[bù mĕi bù méng bù qīng chéng de xiăo nǚ zi]
'Bu Mei Bu Meng Bu Qing Cheng De Xiao Nu Zi' literally means 'a girl who isn't beautiful nor cute enough to topple cities'. This is often self-deprecating humor used in social media indicating modesty or dissatisfaction towards one's appearance.