Green’s Dictionary of Slang

langer n.

[? joc. var. of SE long one or link to langolee n.; all uses equiv. of fucker n.]
(Irish)

1. the penis.

[Ire]R. Doyle Snapper 134: An’ a hefty langer on him, said Bertie.
[Ire]J. O’Connor Salesman 100: There’s a mott in it with a mickey. Serio. Fuckin’ langer on her the size of yer own.
[Ire]F. Mac Anna Cartoon City 184: Why had Mia needed two weeks of time and space to paint a large lopsided langer? Whose langer was it?
[Ire]N. Dorries Four Streets n.p.: The final flow of his exudate slowly oozed out onto the end of his langer.
[UK]S. Kempner Twitter 6 Apr. 🌐 Their pathetic langers getting slimed up.

2. a contemptible person.

[Ire](con. 1970) G. Moxley Danti-Dan in McGuinness Dazzling Dark (1996) I iii: Don’t mind that langer. He hasn’t a clue.
[Ire]L. McInerney Glorious Heresies 90: Well, now the langer’s being there [i.e. a brothel] made sense. The insignificant other of one of the whores, probably a junkie.
[Ire]A. Killilea Boyo-wulf at https://boyowulf.home.blog 14 Apr. 🌐 This miserable boyo hung out for a while in thee home of the langers, ever since the Lord himself had had it up to here with these bloody relatives of Cain.
[Ire]L. McInerney Rules of Revelation 13: ‘[Y]ou have a bit of a wobble, and all around you langers are getting big fucking ideas’.

3. a term of affection/admiration.

[Ire]A. Killilea Boyo-wulf at https://boyowulf.home.blog 31 Mar. 🌐 Chapter four of our absolute langer, Boyo-wulf, is here! I want to preface this post by saying a huge thank you for all the support I have been getting.

In phrases

on the lang

(Irish) engaged in sex.

[Ire]L. McInerney Glorious Heresies 3: [I]t’d still take him only a moment to figure out that his son was on the lang.