Green’s Dictionary of Slang

a lout, a hooligan; a general derog. term used of working-class youths; also attrib.

1922		W. McG. Eager Contemp. Rev. n.p.: Arter annover li’l bi’ one of ve club yobos came along, ’ad a dekko a’ ’im an’ said, ‘’Ere, I am’ goin’ to be mixed up in a rough ’ahse, my name’s drippin’!’ so ’e ’opped it too.
1940		R. Postgate Verdict of Twelve 73: A few yobos who had got nothing to do, and hung around in irritated idleness, spitting manfully in the gutter and telling dirty stories.
1959		C. MacInnes Absolute Beginners 18: ‘This summer can’t last,’ said the yobbo behind the Gaggia.
1964		Mersey Beat 1–8 Oct. n.p.: To quote: ‘These are not mindless yobbos.’.
1970		T. Parker Frying-Pan 139: The country yobbo who made bad.
1979		D. Maitland Breaking Out 256: You’ll be stuck in a Housing Commission slum in Blacktown trying to fellate some sweaty yobbo [...] with skidmarks on his underpants.
1981		W. Boyd Good Man in Africa 128: If he had gonorroea, how, pray, [. . .] had he contracted it in the first place? There was, he knew, only one possible answer [...] HAZEL! [...] The slut, the whore, the rancid filthy tart! It was her and her yobbo boyfriends--she had given it to him!
1985		B. Humphries Traveller’s Tool 110: The old image of a yobbo in a dirty singlet, a chilled tube in his hand and corks hanging off his hat.
1985		J. Sherwood Botanist at Bay 23: Thornhill replied by calling them yobbos and warning them that they would be chucked out of the meeting unless they stopped yahooing about.
1992		R.G. Barrett Davo’s Little Something 17: Yobbos [...] arguing over pool tables and pouring schooners down their throats.
1992		R.G. Barrett White Shoes 35: Probably having been asked the same question a thousand times by the same number of yobbo male tourists.
1999		Indep. Rev. 25 June 6: If you marry this man, when the first flush of love is over, you will be left with a second-rate yobbo.
2002		R.G. Barrett Mystery Bay Blues 205: Some drunken yobbo trying to steal one of the cars.
2004		J. McCourt ‘Vilja de Tanquay Exults’ in Queer Street 305: Well, I came out of hospital, re-entered / Counseling, obeyed the probation yobbos.
2010		W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 59: Backslang is a language form that writes or pronounces words backwards, for example, ecaf (face), riah (hair), say (yes), yob/yobbo (boy).
2016		Facebook 15 July 🌐 It was right next to the watering hole where old mate shit his daks when this daggy, yobbo bugger came at him with an axe. No dramas tonight but, and I lit up a durry, thought about my hard yakka and headed to the dunny.