From "Ranzo Ranzo Ray" and my lasted posted "Rango, rango oh," we get to a chorus of "Jango, my rango, hey!"

Symmes, Elmore. “Aunt Eliza and Her Slaves.” _The New England Magazine_ 15.5 (January 1897): 528-537.

Describing dances among slaves living a bit south of Louisville, KY, after 1838:

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In learning particulars of Aunt Eliza and her slaves, an effort was made to obtain some of the old darkey songs they once sang. Those they composed were generally destitute of rhyme, and after every line there was a refrain, as “Jango, my lango, hey!” or “Ho, Jamboree!” repeated some five or six times.
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Some partial music notation is given for the "Jango" song. The line is sung over an arpeggio of a major chord from low to high. However, the lyrics under the notation change jango to "jingo."