Green’s Dictionary of Slang

(orig. Aus.) a companion, a friend; as a direct term of address.

1908		Bulletin (Sydney) 30 July 14/2: ‘Goo’ day, Mucker!’ ‘’Day, Ponto! ’Ow y’ bumpin’?’ ‘Dead ’ookety, ole cock; feelin’ ’umpty-doo.’.
1939		H. Miller Tropic of Capricorn (1964) 250: God-damn it, Henry, you’re the only real friend I’ve got, but you’re a son of a bitch of a mucker.
1959		F. Norman Fings II i: There’s all me old contacts in me press cuttin’s book, [...] All me old muckers!
1965		E. Bond Saved Scene vi: Yer wouldn’t grass on yer muckers?
1971		(con. WWII) B. Aldiss Soldier Erect 62: ‘You think I’m a bit of a cunt [...] Be honest now!’ ‘’Course I don’t, mucker!...’.
1977		S. Berkoff East in Decadence and Other Plays (1985) 47: He’s my mucker, china or mate.
1985		S. Berkoff West in Decadence and Other Plays (1985) 112: I hate to tell my mucker / my best / that I might carry in my heart / a little doubt.
1998		I. Welsh Filth 40: Listen, Bladesey, my auld mucker, do you mind if I ask you a personal question?
2000		J.J. Connolly Layer Cake 48: I ain’t gonna shaft an old mucker.
2012		S. Moore in Guardian 5 July 🌐 At least my old mucker Germaine Greer showed us her bits.
2018		I. Welsh Dead Man’s Trousers 72: [K]ent ah could count oan ye, ma auld mucker.
2018		H. Betts in Times 30 May 🌐 A male mucker already owns a machine that creates an incredibly impressive dinner for eight.
2020		G. Armstrong Young Team 7: We’ve been best muckers fae our maws planked us doon [...] on the playgroup mat.
2024		J. Meades Empty Wigs (t/s) 134: Most of my muckers at preppers had dadas who were just as queer as Dada, even queerer.