shiznit, i haven't even heard of that one. cool is sort of transcendent, isn't it? never out of style? round about the uh fifth grade? that would've been '79ish? these kids from texas moved into my neighborhood (in VA). they kept saying "decent!" meaning something like "cool" or "more than just good". it really confused me! decent was like a halfway praise, but they meant it way more than that. sheesh!
know what i dig sometimes, is Leave It To Beaver, and all the expressions on there! "Gee Ward, I'm a little worried about the Beav," and other such lines. I really like listening to those old time voices.
anyhoo, it'll all be retro, so righteous to your advice: retro before anyone else!