你头上那一道绿光真漂亮
[nĭ tóu shàng nèi yī dào lǜ guāng zhēn piāo liàng]
In literal translation, it says 'The Green Light on Top of Your Head Is Really Beautiful.' It plays humorously with green, commonly seen as uncomplimentary or related to jealousy in Chinese culture. Therefore this username might contain teasing, irony or self-derision, suggesting that you were cheated on or are naive.