What does ‘cat’s meow’ mean?

The 1920s were an exciting time in the United States. It’s probably why there were so many words and phrases used as synonyms for good! There’s bee’s kneescat’s pajamas … and the cat’s meow.

Saying something is the cat’s meow has a bit of a different connotation than the others. If your doll was dressed in a get up that looked swell, you could say her outfit was the cat’s meow; it was stylish and charming.