Well, five years later we still don't know anything more. I should have pointed out in '04 that the "Idaho version" posted by Q from the Fifes via Logsdon is virtually identical to the version sung (and presumably written) by Oscar Brand on his "Bawdy Western Songs" album of 1960.

Evidently no 'Catters, dedicated as they are, have ever heard a ribald variant of this supposedly widespread cowboy song.