This is the kind of stuff I get to listen to in the making of a slang dictionary: Copulatin’ Blues. The linked site is not quite right as it seems to intermingle songs from volumes one and two of the collection. The “Frankie and Johnny” clip there (from the second volume released in 1984) includes an early use of the word peter meaning “penis.” More than a couple sources claim it’s a Gene Autry recording (this one has the most detail), but it’s difficult to verify.
