It's probably a Dillards song from THE WHEATSTRAW SUITE LP called "The Biggest Whatever".
It got old Joe Wiggins while returnin' a fruit jar out to Bessiemae Hootin's Pa's place,
About a mile out o' town on the West Plains Road--he disapeared without a trace,
They discovered his teeth when the County Police made an investigation of the case,
And cousin Belle Simmons said that Sheriff Cartwright had the strangest expression on his face.
It was the biggest whatever that anybody ever saw,
It was covered with fur and come a-rollin' in from Arkansas,
It was 40 feet high, had a gleam in it's eye, and a big purple patch on it's craw,
It was the biggest whatever that anybody ever saw.
I saw old man Huntsel, he's a hundred an' four, yesterday at Ida Jaffet's house,
Said it's much bigger now than when it carried aff his cow, but its not enough to worry about.
Back before the war there was a whole lot more, but they never come this far south,
I don't mind seein' one from time to time, but I hope it's not it's regular route.