三人行必有我情人
[sān rén xíng bì yŏu wŏ qíng rén]
'In every three people there will surely be my lover.' It's a humorous variation of Confucius's teaching, 'When three people are walking together, one of them can surely be my teacher.' The netizen might use this username to indicate their open-hearted nature, welcoming relationships from all different backgrounds.