The late Boozoo Chavis does a cleaned up version on Rhino Records Cajun anthology "Alligator Stomp" (Vol.1). I believe the liner notes, which I don't have with my used copy, mentioned he'd privately recorded a raunchier version, but I don't know where.

The unexpurgated version of Chavis' "Uncle Bud" appears on his late-nineties album Who Stole My Monkey?, along with another track in a similar vein entitled "Deacon Jones". These two earned Who Stole My Monkey? the distinction of being the only mass-released zydeco album to bear a parental advisory label. It'd be quite a shock to people who have only heard Buckwheat and think that zydeco is children's music.

I haven't been able to completely work out the lyrics, but the parts I can make out go roughly like this:

   Eighteen, nineteen, twenty years ago
   Uncle Bud beat the shit outta Cotton-Eyed Joe
   Uncle Bud!

   Some people say Uncle Bud is dead;
   It's a goddamn lie, he's sick in bed
   Uncle Bud!

   Uncle Bud got a daughter, her name is (Roan?)
   (?) like her father, make an old man moan,
   Uncle Bud!

   Uncle Bud got cotton ain't never been picked,
   Uncle Bud got corn ain't never been shucked,
   Uncle Bud got a daughter ain't never been fucked,
   Uncle Bud!

   Down in Louisiana where the grass grow green,
   They got more bitches than you ever seen,
   Uncle Bud!

   Uncle Bud got this, Uncle Bud got that,
   Uncle Bud got a pecker like a baseball bat,
   Uncle Bud!

   Big fish, little fish, (climbin'?) up the water,
   Some sonovabitch done fucked my daughter,
   Uncle Bud!

   (Jimmy?) come and knock with a pack on his back,
   He bring more cock than he can pack,
   Uncle Bud!

   Some people say (his penis?) ain't right,
   Done made him sick,
   It's a goddamn lie,
   Them Louisiana ho's
   (That run his crank?)
   Uncle Bud!

You can get Who Stole My Monkey? from Amazon.