毛爷爷永垂不朽
[máo yé yé yŏng chuí bù xiŭ]
This username references Mao Zedong (also known as Chairman Mao), the founding father of the People's Republic of China. 'Mao Ye Ye' refers to a familiar and respectful way to call Chairman Mao, and the phrase implies that Mao will be remembered forever.