Why is "纸“ used in "肚纸饿”? 为什么说肚纸饿，不肚子饿?
It is of course not the right way to write it if it meant to say "肚子饿". It could be a fashion trend to use "肚纸饿" to replace "肚子饿" because they sound similar. It is like when English people use french and made it official later on. For example, french people use soudier to mean mercenary and English people used it to create the word soldier. I don't know the fashion trend but that could be a reason.