孟婆孟婆来瓶啤酒
[mèng pó mèng pó lái píng pí jiŭ]
This username creates a humorous juxtaposition. 'Meng Po' is a mythological figure in Chinese folklore responsible for making souls forget their past lives. 'Come and give me a beer, Grandma Meng' plays on this image by asking her for a beer, which is unexpected and amusing.