Well, here's how we sang it at the Fox Inn years ago, as a tag to whatever other goofy thing Bill was hollering:

And there was Grandma,
Swingin' on the outhouse door
Without her nightie,
And Grandpa yellin' "More, more, more!"
Until the hinge broke...
Now Grandma...
Ain't a swinger...
Any mo-o-o-o-ore.