我知道你不当绅士我知道你不是淑女
[wŏ zhī dào nĭ bù dāng shēn shì wŏ zhī dào nĭ bù shì shū nǚ]
Translated as 'I know you don’t behave like a gentleman, I know you’re not a lady', it expresses a mutual understanding between friends or acquaintances who don't follow strict social norms. It shows casual acceptance without judgment.