小三永远是冒牌的
[xiăo sān yŏng yuăn shì mào pái de]
This name reflects the sentiment that a 'third party' or someone interfering in an established relationship will never be genuinely accepted or truly belong. It expresses disdain for the notion of being or dealing with such a situation, highlighting how being 'the other woman/man' is always seen as fake or wrong.