Green’s Dictionary of Slang

(Irish?Scots) a lout, a fool; also attrib.

1821–6		‘Bill Truck’ Man o’ War’s Man (1843) 148: Wad ye be sic a gomeril as to [...] tell on yoursel?
1828		‘Humours of Glasgow Fair’ in Nimmo Songs and Ballads of Clydesdale (1882) 196: O woman! but ye’re a Gomeral [...] D’ye na ken, ye daft gowk, that’s a mongrel.
1837		N. Carolina Standard (Raleigh, NC) 4 Oct. 4/1: ‘Why, you fantastic gomeril’.
1844		London Eve. Standard 20 Oct. 2/5: The heralds and the gomeril crew o’ gowks that they lead.
1858		Huddersfield Chron. 29 May 3/1: ‘Sure yer reverence wudn’t think o’ disgracin’ a beauty like that wi’ sich a gomeral’.
1858		Armagh Guardian 5 Feb. 5/5: ‘D’ye know what it is to hipothcate? Not you, ye gomeril’.
1865		Dundee People’s Jrnl 25 Nov. 2/5: Besides the four gleesome gomerils, there was also a gentleman in the compartment.
1877		Washington Standard (Olympia, WA) 30 June 6/2: ‘Get up with ye, an’ take the reins, you gomeril, you’.
1886		Irish Standard (Minneapolis, MN) 14 Aug. 6: ‘The sorra’s to cure him any way, the dirty gomeril’.
1896		G.F. Northall Warwickshire Word-Book 95: Gomeril. A fool.
1897		N.Y. Trib. 28 Mar. 11/2: ‘Sandy Tosh may thank his stars that he got off with a ducking, the gomeril’.
1900		Bulletin (Sydney) 23 Jun. 31/1: ‘Ye shudn’t resoide too far away from Woolloomooloo, and yure bullit-headid gomeril av a son wud make a first-class chucker-out at the low pub ye’d keep where the poor people ’d be hocussed – git out o’ me road, ye blashted mongril!’ [Kicks the dog and exit.].
1908		L. Doyle Ballygullion 108: Oh! Holy Biddy, but I married the right gomeril. Is it the workhouse ye’d bring us to? [Ibid.] 114: ‘Who’s killed, ye gomeril?’ sez Billy.
1913		A. Irvine My Lady of the Chimney Corner 121: I was fixin’ m’ galluses, over Crawford’s hedge, whin a gomeral luked over an’ says, says he: ‘Morra, Hughie!’.
1936		(con. 1830s–60s) ‘Miles Franklin’ All That Swagger 294: You may drag yours up like a lot of gomerils in moleskins.