Dave Van Ronk does a great little a capella number on his "Going Back to Brooklyn" album. It's called "The Whore of San Pedro."

"The whore of San Pedro
Is older than God,
And her beard tumbles down
to her tits.
With one single bump
of her ponderous rump,
she'll grind your poor pecker to bits."

And there's a second verse that I forget....