萌量不足媳妇快跑萌量充足老公别跑
[méng liàng bù zú xí fù kuài păo méng liàng chōng zú lăo gōng bié păo]
This username combines humor and love, meaning 'If I’m not cute enough, my wife should run away. If I am cute enough, husband shouldn't run away.' It's a funny play on the word '萌' (cute), which is a popular culture reference to the adorableness in people.