What should I understand by “Gollywampus”?

Im not an English speaker, and I found this in a children’s story.

a “wampus” is just a very general broad term for a fictional or fantasy creature or monster. a “wampus cat” comes from native american folklore for a half-cat, half-woman. there are also other fictional stories about alien creatures. the “gollywampus” is just a children’s take on a random creature. it is best known from the story “the old gollywampus”.