Green’s Dictionary of Slang

nonsense! rubbish!

1837		R. Barham ‘Grey Dolphin’ Bentley’s Misc. Apr. 351: The Baron [...] solemnly ejaculated the word ‘Humbug!’.
1843		Dickens Christmas Carol (1868) 5: ‘Bah,’ said Scrooge. ‘Humbug!’.
1855		J. Brougham Basket of Chips 373: They purtend that this here is a hage of henlightenment and hintellect [...] Humbug!
1866		J. Greenwood Little Ragamuffin 258: ‘Humbug,’ ses he.
1874		F.C. Burnand My Time 103: ‘Oh, humbug!’ cried Dick.
1897		Boy’s Own Paper 13 Nov. 104: ‘Bosh! Humbug!’ cried Fraser excitedly.
1900		Marvel 29 May 13: ‘No humbug!’ cried Yates.
1957		G. Kersh Fowlers End (2001) 120: ’Umbug, bloody ’umbug!
1987		N.Y. Times 17 Dec. n.p.: ‘Bah, humbug,’ Senator Alan K. Simpson, a Wyoming Republican, said [R].
2000		Indep. on Sun. 20 Feb. 28: Valentine’s Day – Bah! Humbug!