我不美不萌倾城谁会爱
[wŏ bù mĕi bù méng qīng chéng shéi huì ài]
This online name expresses a sarcastic and playful feeling where the user is self-deprecating, saying 'if I'm not beautiful or cute, then who would love someone like me?'. Here '傾城 (meaning extremely beautiful)' is used ironically to highlight a humorous contrast with the preceding words.