I've heard copacetic/copasetic from time to time here in the US since the 1970s. I'm pretty sure I've even used it myself a few times.

As far as I can make out, it sounds like Kevin Blackmore (from Newfoundland, Canada) says it at the end of the song "Is you 'appy". I've got it on Buddy Wasisname and the Other Fellers' "Greatest Misses" CD.