Green’s Dictionary of Slang

gom n.2

also gaum, gawm, gawmoge, ghomey, gombeen, gomey, gommouge, gorm
[Irish gamal, a simpleton]

(orig. Irish) a painfully stupid or gullible person, a fool.

[UK] ‘Terence O’Shaughnessy’ in Bentley’s Misc. Jan. 42: That the O’Finns and O’Shaughnessys should be disgraced by a mean-spirited gommouge of your kind.
[US]F.P. Dunne in Schaaf Mr Dooley’s Chicago (1977) 271: Listen to me, Jawn, ye poor deluded gom.
[UK]G.B. Shaw John Bull’s Other Island II ii: Yah, you great gaum, you!
[Ire]J. Guinan Soggarth Aroon 78: Musha, Tom Malley, but aren’t you the soft gom of a gossoon to be beat up so easily.
[Ire]P.W. Joyce Eng. As We Speak It In Ireland (1979) 261: Gawm, gawmoge; a soft foolish fellow.
[Ire]K.F. Purdon Dinny on the Doorstep 166: But Dinny! the innocent little gaum.
[Ire]‘Flann O’Brien’ Third Policeman (1974) 164: You are very intellectual and I am certain I am nothing but a gawm.
Britannia & Eve (London) 1 May 73/1: He gave Natty one real up-driven smasher on his flesh proboscis. ‘That poor gom!’.
[Ire](con. 1890s) S. O’Casey Pictures in the Hallway 122: I’m no gaum.
[UK]K. Williams Diaries 26 Jan. 20: Of course he just isn’t true, and not a little unlike a gorm.
[Ire]L. Doyle Back to Ballygullion 156: An’ when that poor gawm made a rush for her.
[UK]I. & P. Opie Lore and Lang. of Schoolchildren (1977) 201: He is – a clodpoll [...] a brainless gorm.
[Ire](con. 1890–1910) ‘Flann O’Brien’ Hard Life (1962) 106: We’d look like bloody gawms.
[Ire]Eve. Press 21 Nov. n.p.: Goms are not famous for their mental brilliance [...] it’s not unusual to hear questions ‘What kind of gom is he?’ or ‘Did you ever see a gom like that before?’ [BS].
[Ire]P. Boyle At Night All Cats Are Grey 196: You’ll have little enough to laugh about if you have poled Cassie as you poled that poor silly ghomey from the Crooked Bridge.
[Ire]P. Boyle All Looks Yellow to the Jaundiced Eye 66: She’ll be sorely missed. Four weans and a thaveless gawm of a father.
[Ire]T. Murphy Morning After Optimism in Plays: 3 (1994) Scene iv: Who’s the gomey?
[Ire]H. Leonard Da (1981) Act I: They said I’d rue the day, and the gawm I was, I didn’t believe them.
[Ire]T. Murphy Conversations on a Homecoming (1986) 39: He was a gomey if you ask me.
[Ire]P. O’Keeffe Down Cobbled Streets, A Liberties Childhood 135: ‘Don’t be a gom,’ Betty snapped.
[Ire]G. Coughlan Everyday Eng. and Sl. 🌐 Gom, Gombeen (n): idiot.
D. Keenan Complete Encyc. of Gaelic Football 23: He must be a complete gom, with no sense at all. That's what has this country the way it is.
Irish Indep. 18 Nov. 🌐 The faces of civil servants [...] signalled that the foreign secretary had blown the exam. In fact, it was abundantly clear both sets politely considered poor Boris [Johnson] to be a bit of a gom.
[Ire]A. Killilea Boyo-wulf at 14 Apr. 🌐 And from him came about all sorts of gurriers; gombeens and loolas and absolute gowls.
[Ire]P Howard Braywatch 2: ‘Albert Reynolds.’ ‘A gombeen and a back-stabber!’.