Green’s Dictionary of Slang

hunkum-bunkum adj.

(US) excellent.

1842		in Spirit of the Times (N.Y.) 5 Nov. 412: Everything was hunkum-bunkum.
1908		L.W. Payne Jr ‘Word-List From East Alabama’ in DN III:iv 322: hunkum-bunkum, adj. Very fine, excellent, good. ‘That’s all hunkum-bunkum.’.
1913		E.L. Warnock ‘Terms of Approbation And Eulogy’ in DN IV:i 24: hunkum-bunkum. Fine, excellent, splendid. [...] ‘What hunkum-bunkum bread you have to-day.’.