我姓吴可我不是三桂
[wŏ xìng wú kĕ wŏ bù shì sān guì]
The user declares, 'My surname is Wu but I am not Three Guil' (a fictional historical figure), indicating they are normal person rather than a notorious one. In history, Wu Sangui betrayed his loyalty during Chinese Civil War, causing national turmoil; this username distances oneself from those characteristics.