二怪
[èr guài]
"二 (èr)" has a similar connotation to ‘dumb’ or 'weird' when prefixed before other words colloquially in some dialects or informal Chinese contexts, and the word "怪 (guài)" itself also means 'strange'. Thus, this internet name might denote a playful, slightly goofy personality, often used by oneself humbly in a self-deprecating humor.