Noun
(idiomatic) A person who performs or appreciates jazz, especially one whose style of speech and movement is relaxed and rhythmic.
(idiomatic) An individual who is at ease and self-assured; one who is calm and composed in interactions with others.
Source: en.wiktionary.orgHe is a cool cat. I was surprised when he had a heart problem...People think my film with Mani, ‘Nayakan', is my best work. To an extent it's true. But I'd like to think my best is yet to come. Kamal Haasan
Clark Gregg is so cool. He's a pretty cool cat. People are drawn to him. Maurissa Tancharoen
He's a real cool cat. Heydar Aliyev
For these, Blanc voiced Daffy Duck and Speedy Gonzales, the characters who received the most frequent use in these shorts (later, newly introduced characters such as Cool Cat and Merlin the Magic Mouse were voiced by Larry Storch ). Source: Internet