When we were children we all sang that at the end of fun songs, for instance "I've been working on the Railroad". Don't know where it originated, but it was wonderful to add to our mountain music and we kids added a few naughty endings of our own when Dad wasn't listening. Ex. "And there was grandma, without no pants on, swinging on the outhouse door, with Uncle Henry, grabbing her down on the floor" Gee, I miss being a kid.