Personally I use the words: "fresh" "sweet" and "boss" What other words do YOU use for the word "cool"? I realize there are some outdated ones like "bad" and "gnarly" and if you use them, I wouldn't admit it if I were you *giggles*
hot fuck groovy neat 'that's the jazz' 'jazzin'!' ring-a-ding-ding! hot-dang-gilly that's jazzin'! is really neat to say