Green’s Dictionary of Slang

my oath! excl.

(Aus./N.Z.) a mild excl.; often as an affirmation; often intensified with an adj.

[Aus]Bell’s Life in Sydney 13 Feb. 2/3: ‘My oath,’ as a snug turfite is apt to repeat, ‘he was all there’.
[[UK]H. Kingsley Recollections of Geoffrey Hamlyn cap. xxiii: ‘Oh my—(colonial oath!)’ said the other; ‘oh my----'cabbage tree!’].
[Aus]Golden Age (Queanbeyan, NSW) 4 Sept. 3/2: Does a man ask Tom if he ever heard of the Hithard Slasher? ‘Heard of him? my oath! Yes, sir’.
[Aus]Bulletin (Sydney) 28 Feb. 13/3: His ol’ dad’ll miss him, but, my oath, if them there Arabs thinks they’ve got a ‘slouch’ in Bill, they’ll be sucked in, you see.
[Aus]K. Mackay Out Back 117: ‘My oath!’ ejaculated that worthy.
[Aus]H. Lawson ‘His Colonial Oath’ in Roderick (1972) 78: Then he added, ‘My blooming oath!’.
[UK]Notts. Guardian 3 June 8/7: I’ll take my colonial oath [...] that hit of midwinter’s [...] knocks spots off Bonnor’s record at Lords.
[Aus]W. Aus. Sun. Times 24 Sept. 7/2: [title] Bill Bludger — My Oath!
[Aus]H. Lawson ‘Send Round the Hat’ in Roderick (1972) 479: My oath! I’d take the train to-morrer only I ain’t got the stuff.
[Aus]L.M. Palmer-Archer Bush Honeymoon 148: ‘My jolly oath, I will!’ says Yellow Billy fervently .
[Aus]E. Dyson Roaring Fifties cap. vii: ‘My colonial, you sprint like an emu!’ gasped the latter [Ibid.] cap. xiii: Con uttered a corroborative ‘My colonial oath!’ that was eloquent of a grateful heart.
[Aus]C.J. Dennis ‘A Digger’s Tale’ in Chisholm (1951) 100: ‘My oath!’ the Duchess sez. You’d not ixpect / Sich things as that.
[Aus]K.S. Prichard Working Bullocks 113: ‘My oath,’ Red agreed.
[Aus]Mirror (Perth) 29 Jan. 11/3: They are the men who [...] will sail to Pommieland to keep the kangarooster’s tail up [...] my blooming oath they will!
[Aus]L. Glassop We Were the Rats 259: ‘My oath. We’ll give ’em Singapore.’ ‘With knobs on.’.
[NZ]G. Slatter Gun in My Hand 178: But she was worth it. My oath.
[UK]R. McGregor-Hastie Compleat Migrant 16: ‘My flamin’ oath!’ says the native’s friend.
[Aus]R. Beckett Dinkum Aussie Dict. 36: My oath: A reply to almost anything as in: ‘It’s a hot day.’ ‘My oath.’ ‘It’s a cold day.’ ‘My oath.’ ‘Would you like a drink?’ ‘My oath.’ ‘How’s about going up the Cross and getting on the piss and picking up a coupla sheilas?’ ‘My bloody oath.’.
[Aus]P. Temple Black Tide (2012) [ebook] Looker she was. My oath.
[Aus]P. Temple Black Tide (2012) [ebook] ‘I take it Gary wouldn’t be the choice.’ ‘Bloody oath’.
[UK](ref. to 1950s) C. Lee Eight Bells & Top Masts 139: These were the 1950s. [...] [Australians] said things like ‘Strewth’ and ‘My flamin’ oath’ and called each other Mate.
[NZ]McGill Reed Dict. of N.Z. Sl. 139: my oath! Exclamations of affirmation. ANZ.

In exclamations

my bloody oath! (also blood oath! bloody oath!)

(Aus.) a mild excl.

[Aus]R. Marsh Seven Years of my Life 70: Come along you bloody crawlers, you’ll have to walk faster than this tomorrow, with a cart load of stone — my bloody oath you will [AND].
[Aus]D. Stivens Tramp and Other Stories 5: Can he fight? My bloody oath he can!
[Aus](con. 1940s) E. Lambert Veterans 39: ‘You like music, boy?’ he asked ‘Bloody oath!’ ‘Guess that means yes,’ he smiled.
[Aus]F.B. Vickers Mirage (1958) 235: ‘We’ll all have things, Nona.’ ‘My bloody oath we will!’ George said.
[Aus]‘Nino Culotta’ Cop This Lot 17: ‘Up ter the pub, eh?’ ‘Bloody oath,’ Dennis said.
[Aus]F.J. Hardy Yarns of Billy Borker 26: My bloody oath, I did.
[Aus]D. O’Grady A Bottle of Sandwiches 10: Bloody oath. Three raw eggs for breakfast.
[Aus]J. O’Grady It’s Your Shout, Mate! 33: Bloody oath. We grow the world’s best barley.
[Aus]Lette & Carey Puberty Blues 20: ‘Comin’ down the paddock on Friday?’ [...] ‘Bloody oaf. Gunna meet Boardie, Debbie?’.
[Aus]R.G. Barrett White Shoes 50: Bloody oath [...] I just hope you’ve got enough in the kitchen.
[Aus]Penguin Bk of All-New Aus. Jokes 175: ‘We saw some frogs [...] and then we put firecrackers up their arse.’ ‘Rectum, Tommy,’ Mum said reprovingly, ‘rectum!’ And Tommy said, ‘Blood oath we did!’.
[NZ]McGill Reed Dict. of N.Z. Sl. 25: bloody oath! Affirmative intensive.
[Aus]C. Hindrum in Tasmanian Times 4 Feb. [Internet] Bloody oath, mate, this country needs a shakeup.
my colonial oath! (also my colonial!)

(Aus./N.Z.) a mild excl.

[UK]H. Kingsley Recollections of G. Hamlyn (1891) 196: ‘Oh my — (colonial oath!)’ said the other; ‘oh my — ‘cabbage tree!’.
[Aus]Glen Innes Examiner (NSW) 26 Oct. 6/1: ‘My Colonial ain’t Phil Beck a hout-and-houter? he is an’ ot ’un and no error’ .
[Aus]‘Rolf Boldrewood’ Robbery Under Arms (1922) 239: My colonial oath, Dick, you’re quite the gentleman.
[Aus]H. Lawson ‘Thin Lips and False Teeth’ in Roderick (1972) 243: He only remembered such remarks as ‘My oath’, ‘My colonial oath’, ‘My (adjective) oath’.
[Aus]Bulletin (Sydney) 13 Dec. 3/2: ‘Good dog, that. Can he work?’ ‘My colonial! Why, he kept the house goin’ for months.’.
[NZ]Ellesmere Guardian 27 May 4/3: ‘My Colonial,’ Oath of affirmation.
[Aus]D. O’Grady A Bottle of Sandwiches 30: ‘My colonial,’ Doug said.
[NZ]McGill Dict. of Kiwi Sl. 74/2: my colonial oath! a mild expletive used usually as reinforcement, with variations such as my oath!, my bloody oath!, my bloody colonial oath!
[Aus]G. Seal Lingo 45: In ‘The Bastard [from the Bush]’, the Captain asks the stranger: ‘Would you stoush a blanky Chinky?’ And the stranger replies, ‘My colonial oath I would!’.
[NZ]McGill Reed Dict. of N.Z. Sl. [as cit. 1988].
my fucking oath! (also my ’king oath! fucking oath! kern oath! kin oath!)

(Aus.) a mild excl.

[Aus]Bastard from the Bush in Moore (ed.) Censor’s Library (2012) [ebook] And would you have a moll to kep you and swear off work for good? / And the bastard from the bush replied, ‘My fucking oath I would!’.
[Aus]Baker Popular Dict. Aus. Sl. 48: my ’king oath! A vulgar variant of ‘my oath!’.
[Aus]Baker Aus. Lang (2nd edn) 204: [Exclamations] Agreement: blood oath! kern oath! myking oath!
[UK](con. 1940s) G. Dutton Andy 266: My fucken oath I would.
[NZ]G. Newbold Big Huey 110: ‘You want to carry on with it?’ he asked Mat. ‘Yeah, fucking oath I do!’ replied Mat.
[UK]Partridge DSUE (8th edn) 772/1: my king oath! Aus. var of my oath (Baker) since ca. 1910. Strictly king short for fucking but cf. also king-hit.
[NZ]McGill Dict. of Kiwi Sl. 66/1: ’kin oath rude avowal; contraction of ‘fucking oath’.
[NZ]McGill Reed Dict. of N.Z. Sl. [as cit. 1988].
[Aus]S. Maloney Sucked In 117: ‘’ken oath,’ I said.
[Aus] L. Redhead ‘Grassed’ in Crime Factory: Hard Labour [ebook] Fucken oath. You’ve got it sweet, haven’t you, champ?
[Aus]me-stepmums-too-fuckin-hot-mate at www.fakku.net [Internet] Fuck oath, park yer bones.