Why do people say that Zhu Bajie’s sister-in-law is stupid? What does that mean?

Whether Zhu Bajie’s sister-in-law is so stupid is a mystery.

This meme comes from an ancient joke, saying that Zhu Bajie’s second aunt was too greedy. One day, she saw a little pig rolling in the mud and thought it was very funny, so she jumped into the mud too. , she fell into the mud because she was too heavy and couldn't get out. When she was finally rescued, she had drowned in the mud.

This story is used to ridicule those who are gluttonous and have no self-awareness, so Zhu Bajie's sister-in-law is used to ridicule those who are in danger because of their gluttony. However, this story is just a joke and not a real historical event.