I googled it and found this for you:
copacetic - Wiktionary
It doesn't help much.
Since I came to the USA, I've heard this expression and use it every now and then. Don't know if this is the right spelling, I do know is used to express: everyhting's fine.
Where does it come from? I even made my own assumption that it was a combination of " cup and ascetic", for some weird reason. Maybe is yiddish? Haven't the slightest idea. Can someone please tell me its origin?
Thank you kindly.
Yes, I had seen that also, it says it's not a certain theory. Somewhere else said that it could've started in Harlem among musicians. OK.
Thank you so much Rover KE, I appreciate your help.
Not a teacher.
I think no one could tell you the origin of this word because it is not known for certain. We can talk about theories only. You can find some of them at the following sites:
Gwyn - Copacetic
The Straight Dope: What's the origin of "copacetic"?
Gettin' Copacetic With Copacetic: A Panoply of Copacetic Definitions
I think it could be Fr. complaisant, or co + pace + tique for fine and peaceful.