草蛋世界
[căo dàn shì jiè]
In English, it could be translated as 'Grass Egg World', an expression of absurdity. It's more or less equivalent to the saying “what a crazy/crazy world”. The person who uses this nickname might have found something funny and ridiculous happening around, and they may have created this humorous name to express their feelings about certain events and society with humor and sarcasm.