My father sent me this version of the lyrics he learned as a boy in Tennessee.

JIMMY CRACK CORN

When I was young, I used to wait
Upon ol' massa every day
Passed down the bottle when he got dry
And chased away the blue-tailed fly.

Jimmy crack corn and I don't care
Jimmy crack corn and I don't care
Jimmy crack corn and I don't care
The massa's gone away.

The pony run, he bucked and kicked
He threw ol' massa in the ditch
He died and we all wondered why
The verdict was the blue tailed fly.

They buried him under a 'simmon tree
His epitaph is plain to see
"Beneath this sod I'm forced to lie
A victim of the blue-tailed fly"

Hope this helps