小三收起你伪装的可伶
[xiăo sān shōu qĭ nĭ wĕi zhuāng de kĕ líng]
This translates to 'Cheater, stop pretending to be pitiful'. It’s used as a strong accusation against someone who's having a secret romantic affair (a 'third party' in Chinese culture) while trying to appear innocent or pitiable.