小三再美小四更眉
[xiăo sān zài mĕi xiăo sì gèng méi]
This name carries a very negative and derogatory connotation. '小三' refers to a third party or a mistress while '小四' is an even further extension, suggesting even lower moral standards in a relationship setting. The latter part '更眉' adds a twist that implies someone is prettier but in essence highlights infidelity.