小三玩的始终都是二手货
[xiăo sān wán de shĭ zhōng dōu shì èr shŏu huò]
This nickname has a rather strong satirical meaning. It suggests a mistress or an uncommitted partner only gets a less authentic (second-hand) treatment compared with a formal wife or relationship. This kind of nickname might appear on social media for users to mock disapproving social roles or express dissatisfaction about such phenomenon.