当年流行小三抢老公现在流行闺蜜抢男友
[dāng nián liú xíng xiăo sān qiăng lăo gōng xiàn zài liú xíng guī mì qiăng nán yŏu]
This means 'It was popular for mistresses (third party) to steal husbands back then; now it's trendy for best friends to take boyfriends.' It expresses a social commentary on changing patterns of betrayal in relationships.