Green’s Dictionary of Slang

bontosher n.

also bontodger, bontojer, bontosh, bontoshter
[ Fr. bon toujours, good all the time]

(Aus.) a term of the highest praise, something excellent.

[Aus] Bulletin (Sydney) 14 Apr. 29/1: A bontosher is a real slasher, a fair hummer, virtually a past master [...] but no female has yet achieved the dignity of a bontosherina. [Ibid.] 5 May 17/3: ‘Bonster’ is a corruption of Bontojer, pronounced Bontodger, and Bontojer is a corruption of the two French words bon and toujours — ‘always good’.
[Aus]Sydney Sportsman (Surry Hills, NSW) 14 Sept. 6/1: I can promise my readers a bon-todger battle.
E.Dyson in Bulletin (Sydney) 18 July 39/2: ‘Better’n a pantermine, he sez. Sez he never larfed so much since mother blew up.’ ‘That’s bon tosh,’ said Cilly, with enthusiasm.
[Aus]E. Dyson ‘Barracking’ in Benno and Some of the Push 144: ‘Oh, a bonzer, a bonzer, a boshter, a bontoshter!’ screamed our Christian brother.
[Aus]Sydney Sportsman 15 Jan. 2/6: Now while we credit Tom with being a bon-tosher on the cloth of green, still we watched every move of our newly found friend Cecil.
[Aus]Sun. Times (Perth) 11 Jan. 3/2: Tuesday evening saw a duststorm – a beauty, a regular bontosher – and that gave us a cool night and brought temperatures down.
[Aus]Wkly Judge (Kalgoorlie) 22 Feb. 2/3: With a bontosher like Claro in the Newmarket, the Victorian trainers have something warm to beat.
Advocate (Burnie) 11 Mar. 8/5: It is no uncommon thing for an enthusiastic skip [...] to coin fresh phrases about particular bowls that are making advance to ‘kitty,’ and such terms as ‘bobby dazzler,’‘bontosher’ and right on the doodah’ are often heard.
[Aus]Baker Aus. Lang.
[Aus]D. Stivens Jimmy Brockett 141: It was a bontosher of a flat though. I’d slipped in during the afternoon to have a decker at it.
[Aus] (ref. to 1900s) G. Seal Lingo 58: bon had been in Lingo usage for more than a decade before World War I began in such combinations as it’s a bon, ain’t it [...] bonsterina, bon ton [...] and bontosher.

In derivatives


someone (female/male) exceptional, outstanding.

[Aus]Bulletin (Sydney) 14 Apr. 29/1: A bonsterina is a female bonster, but no female has yet achieved the dignity of a bontosherina.
[Aus]Le Courrier Australien (Sydney) 29 May 5/1: [A] dame to you is a sort to us; a blue-stocking is a wowser, a wow [...] is a bonzer, bosker, boshter, bonzerina, bonzo, bontosherino or bonze.