我不傻不美不萌我不笨不帅不酷
[wŏ bù shă bù mĕi bù méng wŏ bù bèn bù shuài bù kù]
In essence, this username means that “I'm not foolish, but not smart; not beautiful, yet not ugly; not young-looking or cute, also not old looking”, and “not handsome or cool, and also not foolishly handsome”. It can be seen as an honest self-assessment. On one hand, he or she acknowledges the shortcomings or ordinariness of his or herself. On the other hand, it shows the acceptance of one's uniqueness, and the humorous self-deprecation brings some lightness into the statement.