OK. Agree or disagree.
'Cool' is merely an onomatopoeism for awe and reverence.
The Word Previously Known As 'Coo!' in The Dandy, Billy Bunter, and every kids comic I can remember.
It's like Mmm. Or Wow! As universal as a nodded head for yes ... (exceptions here ............)
It has taken on a life of its own beyond its cradle origins, but if you want to know what it really means, just listen to yourself the next time you are passed on the motorway by that Bugatti you've always fantasised about.