Hey.

Lyrics I know are the chorus (above)

And another part is:

Oh, my Barney, oh, my Barney, had a jail and couldn't lock it.
Had one bullet for his pistol, had to keep it in his pocket.

Now that appears to be another song - sung to the tune of Clementine, but it also appears in the "Nip It In The Bud" and actually continues with a part that is:

"His left front pocket.
Episope 125 (or whatever #) His right front pocket.
All other episodes - His left front pocket."

The refference is that he appeared to keep his bullet in a different pocket in only one of the episodes that shows the bullet in the pocket gag.

I know this is espteric, but I can't believe that the lyrics aren't out there.