水浅王八多遍地是大哥
[shuĭ qiăn wáng bā duō biàn dì shì dà gē]
It conveys a vulgar and humorous idea that 'everywhere is dominated by pretentious people' where the word 'wangba' (王八), literally meaning turtle, can also stand for a kind of arrogant or hypocritical person here. This username has an earthy, somewhat rebellious tone.