Not from a book, but from my husband: copacetic - all right, satisfactory, in good order. Apparently the US military uses it a lot?

I looked it up, and it's one of a few non-slang words of unknown origin. As in, the dictionary has no idea where it came from, only that it was first recorded in the 1920s and it's uniquely American. Wikipedia says it may have been from a misheard Yiddish expression.