毛主席穿内裤只为了挡中央
[máo zhŭ xí chuān nèi kù zhĭ wéi le dăng zhōng yāng]
This username plays on words and implies that even the late leader Mao Zedong had to conform to the central authority. In fact, it uses sarcasm, suggesting even powerful figures cannot act outside rules or norms. This usage might be seen more as wordplay rather than serious content.