What does the Japanese ghost playing with a stick mean?

This is an allusion. There is an old opera in my hometown of Lujiang, Anhui Province. When I was a child, I heard an old opera singer say it. I no longer know what it is or what the content is. I only remember that it is about a man named Wang Kui who has a relationship with a female ghost Yun Yu. As the sun shines, this female ghost turns into a stick. So there is a saying in my hometown called "Wang Kui Ri Gui Ri Bang Chui". It doesn't have any special meaning, it's just a joke. Later, it was said that when a person encounters something strange, he will say "he is a ghost". This is probably how it came about.