我的男人小三别碰我的女人小三别沾
[wŏ de nán rén xiăo sān bié pèng wŏ de nǚ rén xiăo sān bié zhān]
This username translates to 'Keep away from my man, third party; keep away from my woman, third party.' It is a protective and possessive statement showing strong territorial feelings about one's partner and not accepting any third-party interventions.