Hank fooled around a lot with words in this song. "Tippy-to" instead of Thibodaux, Fountain-O for Fontainenot, for example. He mispronounced Bayou to be Buy-O, so it would rhyme with me oh my oh and Pirogue. He even said Jumbalaya rather than Jambalaya.
Almost forgot, Filly-gumbo? It's fillet Gumbo! Or as the Cajuns prounced it fee-lay.
He "borrowed" the melody from an old Cajun song named Grand Texas, but the words were definitely his own!
DonM