"The Cat's Pajamas" is a phrase that means something is excellent or outstanding. It is often used to describe a person, object, or experience that stands out as the best among others. The expression has its roots in the early 20th century and reflects a playful attitude toward language. In addition to its idiomatic use, "The Cat's Pajamas" is also the title of a children's book by Margaret Atwood. The story features a cat who embarks on an adventure, showcasing themes of friendship and self-discovery. The book is celebrated for its charming illustrations and engaging narrative.