毛爷爷做灰机来到日本干架
[máo yé yé zuò huī jī lái dào rì bĕn gān jià]
This nickname combines a playful reference to Chairman Mao Zedong ('Grandpa Mao') and an exaggerated adventure scenario of him flying a plane to Japan for a fight. It's a humorous and surreal name that reflects a fantasy or comedic element.