"Peter Rumpkin" by Willa Mae Buckner appears on 3 different compilation CDs, all published by the Music Maker Relief Foundation:

Expressin' the Blues
A Living Past
Music Makers: Portraits and Songs from the Roots of America (a book and CD)

There's a sound sample at Yahoo! Music:

...Brother Jim, what's we gonna have for supper?
To heck with the man who's got a wife and don't know how to--
Pump-a-dump-a all night long, whiskey's in the glass
Anybody here don't like this song, they can just--
Kiss me once, kiss me twice, kiss me once again.
It's been a long, long time...

It sounds like one of those "Sweet Violets"-type songs where the rhyme scheme leads you to expect something obscene, and then something relatively clean is substituted.