COOL

Cool(sometims awesome)
In Korea, I'd learned that COOL is the opposite to warm. On the basis of this semantic, it is not likely to be used a lot. But, COOL is what I hear frequently. Cool, cool, and cool. People use this a lot. It looks habitual. COOL comes out spontaneously from their mouth no matter what happens. I am thinking if there is a word in Korea that works for any occasions. Hum.. I do not know.

It is like that saying COOL sounds cool. Sadly, its pronunciation isn't easy to get. I have tried to say it several times, but I sounded very awkward. Embarrassed. Better not try. Anyway, what is COOL? Why COOL? I am curious.