我不信你不懂
[wŏ bù xìn nĭ bù dŏng]
This username 'Wo Bu Xin Ni Bu Dong' can be translated as 'I don't believe you don't understand'. It expresses the user's suspicion and disbelief, suggesting they think others should or must understand something that may actually not be comprehensible to outsiders. The expression implies a sense of confidence in one's knowledge or view.