Dear Spanner:
The word "copasetic" is not used very often. In fact, the first time that I ever heard the word was in the lyrics of a song entitled "L.A. Fade-away" by the Grateful Dead - "...But the pay was pathetic, I wish those boys could have been more copasetic." So, in this context, it could mean "generous" or "kind" or "nice." Basically, the word has a broad range of meaning and can find its gneneral equivalent in the term "cool," which - as every American knows - is the opposite of "sucks."