Green’s Dictionary of Slang

fluker n.

[logically fluke n.2 (1) or fluke v.2 but sense 1 is earlier than available cits.]

1. a lucky blow.

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[US]N.-Y. Eve. Post 19 Nov. 2/3: Devereux had said ‘Captain, the damned English rascal has given me a fluker.’.

2. a lucky person.

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[UK]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.