The way it's rhymed and written, it would be a waste if it weren't.

For certain and for sure.

Maybe it's somewhere in the Newfoundland folk tradition; I just couldn't find much attestation for it online.

I've a couple of books of Newfoundland songs. I'll have a look through them. I've a friend up there as well--I might ask her, an I think about it, although she's busy lately, between writing sf/f pron and having a baby on the way.