别说我胖我已经很瘦了别说我瘦我已经很胖了
[bié shuō wŏ pàng wŏ yĭ jīng hĕn shòu le bié shuō wŏ shòu wŏ yĭ jīng hĕn pàng le]
It is self-deprecatory humour, meaning: 'Don't call me fat because I'm already skinny. Don't call me skinny because I'm really fat'. Expresses someone struggling with body image issues, finding neither compliment convincing.