What is the idiomatic meaning of cool cat?

"Cool cat" is an idiomatic expression that means a person who is calm, relaxed, and sophisticated. It suggests someone who is fashionable, trendy, and in control of their emotions and actions.

Here are some synonyms for "cool cat":

* Smooth operator

* Hipster

* Trendsetter

* A-list

* In the know

* Chic

* With it

The phrase originated in the 1950s and 1960s and was associated with the jazz scene and cool jazz music. It became popular in mainstream culture and has remained a common idiom for describing someone who is stylish and confident.