你的脸没有粉笔白我的脸只有黑板黑
[nĭ de liăn méi yŏu fĕn bĭ bái wŏ de liăn zhĭ yŏu hēi băn hēi]
This saying humorously comments on skin complexion: 'Your face isn't white like chalk, mine is black like a blackboard', possibly implying a playful but self-deprecating remark about skin color or complexion contrast between two people.