Green’s Dictionary of Slang

stumpy n.¹

money.

1821		W.T. Moncrieff Tom and Jerry III iii: Now then for the stumpy (searching about in his pockets for the money.).
1824		Exeter Flying Post 10 June 2: The winner, in addition to the stumpy (money); to be blessed with the full and sole enojoyment of a knight of the whip.
1836		Dickens ‘The Last Cab Driver’ in Slater Dickens’ Journalism I 149: Reduced to despair, they ransomed themselves by the payment of sixpence a-head, or [...] ‘forked out the stumpy.’.
1841		W.J. Neale Paul Periwinkle 166: You mustn’t expect to have all the work done without coming down with some of the stumpy.
1843		N.Y. Sporting Whip 25 Feb. n.p.: Fork over the brads, to pint the stumpy — the tin — the needful — in English, the money.
1852		‘Epistle from Joe Muggins’s Dog’ in Era (London) 4 Apr. 4/3: [C]ollectin all their stumpy for to tip the winners with.
1856		Melbourne Punch 20 Nov. 4/1: ‘Proposals for a New Slang Dictionary’ [...] PEWTER.—Noun. Brads, rhino, blunt, dibbs, mopusses, browns, tin, brass, stumpy, &c.
1857		S.F. Call 26 Mar. n.p.: [He] Went to fight the furious tiger, / Went to fight the beast at faro, / And was cleaned out so completely / That he lost his every mopus, / Every single speck of pewter, / Every solitary shiner, / Every brad and every dollar [...] All the rowdy, all the stumpy.
1860		Bell’s Life in Sydney 22 Dec. 3/2: [He] was ordered some twelve months ago, by the Bench, to fork out a weekly allowance of ‘stumpy’ for [...] maintenance.
1864, 1867, 1870		Hotten Sl. Dict.
1866		Letters by an Odd Boy 101: ‘Look here, got any tip?’ ‘Tip?’ ‘Ugh! yer six days old! Eyes not open yet, eh! — blunt, stumpy, coppers — a joey — a tanner — a bob — money, yer muff’.
1880		London Standard 12 Feb. 6/3: Look at Mr Gladstone , he draws not the ‘stumpy’ but at least equivalents in kind, new rigouts from silk hats to shepherds’ plaid unmentionables.
1895		Crowe Aus. Sl. Dict. 82: Stumpy, money.
1936		Nottingham Eve. Post 9 Oct. 5/4: Some synonyms for money are simply fanciful [...] Why ’darby,’ or ‘mopusses’ or ‘stumpy,’ or a hundred others?

In exclamations

down with the stumpy!

lay down your cash!

1849

C. Kingsley Alton Locke (1850) 24: Down with the stumpy—a tizzy for a pot of half-and-half.