Green’s Dictionary of Slang

to get a piece of good luck, to achieve something through sheer luck.

1885		Bulletin (Sydney) 14 Mar. 11/1: This is usually the trophy-sum offered to the highest scorer in a cricket match, though Charlie Bannerman, the other day, got three times that amount (cash drawn) for phenomenally fluking over three score.
1890		‘F. Anstey’ Voces Populi 84: What’s good form against such infernal fluking?
1910		Bulletin (Sydney) 15 Sept. 13/3: I fluked a ride with the mail-cart as far as the fence, and had dinner with a cocky.
1922		Wodehouse Clicking of Cuthbert 129: Everybody knows that he is the world’s champion fluker. I, on the other hand, invariably have the worst luck.
1941		D. Davison ‘Return of the Hunter’ in Mann Coast to Coast 100: A man might fluke it, you know.
1946		D. Stivens Courtship of Uncle Henry 72: When it looked the canary might fluke the door he would shut it quick, and open it again.
1953		I. Hamilton Till Human Voices Wake Us 106: An egg, a thing you never see in the boob unless you fluke it from the screw’s cook-house.
1967		B. Crump Odd Spot of Bother 115: You’re just an ordinary bloke who’s fluked a roll in a raffle.
1978		P. Theroux Picture Palace 242: I never could take another picture without bluffing, as I had fluked Firebug.
1981		A. Weller Day of the Dog 33: Only Doug fluked a win, a hideous pink bear for his lady love.
1998		R.G. Barrett Goodoo Goodoo 3: Les had fluked himself a nice little earner when he accientally found the Kruggerands [sic].
2005		A. Malhotra How to Excel in Examinations 5: However, when the results for lIT entrance examination were announced, I did go to check the results in case I had fluked it.