Green’s Dictionary of Slang

excellent, first-rate.

1906		Sun. Times (Perth) 18 Feb. 6/1: And remember that alliteration’s apt and artful aid / Makes a boskerino West Australian verse.
1906		Sun. Times (Perth) 19 Aug. 4/3: By the way, what do you think of my command of the vernacular? Isn’t it boskerino?
1908		Arrow (Sydney) 19 Sept. 9/2: ‘One day last week I nearly caught a fish here that was that long. It was a Boskerino Bontodger. He got off!’.
1914		Truth (Melbourne) 31 Jan. 6/1: What’s that? Bathing? Lumme, yes; all morning, afternoon, and evening. Boskerino! Cush, and all sigarnio, my oath!
1929		Teleg. (Brisbane) 16 Oct. 16/2: A trip to One Tree Hill was a special delight, and when requested to write the visitors’ book an opinion of the glorious panoramic view, the verdict was: ‘Boskerino absolute’.