我不是帅比而是傻比我不是萌比而是逗比
[wŏ bù shì shuài bĭ ér shì shă bĭ wŏ bù shì méng bĭ ér shì dòu bĭ]
This translates roughly to 'I am not a cool person but a foolish one; I am not cute but funny.' The nickname uses self-deprecation to express the owner's humorous personality. They acknowledge they're not good-looking or super cute, instead embracing their fun-loving, quirky nature.