说你人渣还算好听了点
[shuō nĭ rén zhā hái suàn hăo tīng le diăn]
On a direct interpretation, it would mean something like 'Saying You Are Scum Is Actually Complimenting You'. Similar to the 'Bitch comment', such username is not polite when viewed in the face of it. Despite possibly indicating humor between friends, this term generally holds derogatory meaning when speaking formally.