An expression I've heard only in Utah is "my hell!", as a way of expressing astonishment or disgruntlement. Some Utahns will even say "my heck" as a means of softening the blow.

When I was a kid, my Mom got a good laugh when I asked her about what life was like when she was a kid "back in the olden days."

Copacetic I have used a number of times, meaning(for me) in agreement, or being on the same page, not necessarily to describe something good or excellent. "She and I disagreed on most Mexican food, but when it came to rellenos we were copacetic".