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Grandpa Turpin would sing those lines while playing his guitar, and when he finished he would just laugh.
Isn't Google wonderful! By simply googling part of a line that I could remember, both the lyrics and an audio clip of the song were instantly on my screen!
The song's title is "Long Boy." It was a World War I song released in 1917. The lyrics are here (PDF document), and the audio clip is here (mp3 file).
I am assuming that these materials have passed into the public domain. If such is not the case, please let me know, and I will correct the situation.