我和小三是闺蜜我和外遇是基友
[wŏ hé xiăo sān shì guī mì wŏ hé wài yù shì jī yŏu]
'Xiao San' means the 'third person' who gets between a couple, often with a bad intention, while 'Waigui' means someone who has affairs outside the relationship, usually also seen in a pejorative light. This sentence says that she and those kinds of people are close friends. The name shows the speaker's ironic view toward traditional moral constraints, possibly suggesting a very liberal lifestyle.