I remember well hearing Uncle Dave Macon doing his Chewing Gum number on the Grand Old Opera on WLS Nashville. circa 1928 et seq. It seemed to be a novelty devised to let the banjo take over from vocals on the words "chewing Gum."

I've never seen the words in print and am not familiar with the Carter Family version. Some of the words go:

"Well, I'm gonna tell you 'bout my pretty little miss
She's just as pretty as a plum,
But everywhere she went, she would spend her last cent
on chewin' gum, chewin' gum. (banjo repeats)

She had feathers and finery and she had a pretty little chum
But everywhere she went, she would spend her last cent
on Chewing gum, etc.

Lane goldsmith (lingolucky)