小三我想一巴掌扇死你好吗
[xiăo sān wŏ xiăng yī bā zhăng shàn sĭ nĭ hăo ma]
'Little Third, I wonder if I can slap you to death.' This expresses frustration towards an unwelcome third party in a relationship, typically referring to a mistress in a marriage (often called 'the little third' or 'fox spirit').