Green’s Dictionary of Slang

hornswoggled adj.

(US) a euph. for damned adj.

1840		T. Haliburton Clockmaker III 211: Nothin’ makes me feel so onswoggled as one of them ‘I guess-you-may-go’ kind of stares; it’s horrid.
1887		W. Kansas World (Wakeeney, KS) 24 Dec. 1/4: I’ll be eternally hornswoggled if I don’t draw the line at custard pie.
1890		Star (Guernsey) 9 Aug. 4/1: Favourite ‘Swears’ of Eminent Americans [...] Mr Keene remarks ‘I’ll be hornswoggled’.
1902		Minneapolis Jrnl (MN) 6 Sept. 4/3: The enterprising New York Sun [...] pleads for a thesaurus of fine old English and American ‘cuss words’ [...] such beloved ejaculations as ‘Oh, pants!’ ‘I’ll be hornswoggled,’ ‘I’ll be dingswizzled!’.
1911		Daily Ardmoreite (Ardmore, OK) 31 Jan. 5/5: When ‘Uncle Tony’ read the letter he said: ’Well I’ll be hornswoggled’.
1918		R. Dirks ‘Hans und Fritz’ [comic strip] Off wit’ the dicer, you hornswoggled galoot!
1918		Buffalo Eve. News (NY) 11 May 7/7: ‘Well, I’ll be hornswoggled,’ ejaculated Mr Simp.
1922		Morn. Tulsa Daily World (OK) 17 Dec. 74/3: Wall — Ah’ll be tarnation hornswoggled — it’s Daiseh!