Green’s Dictionary of Slang

a fool, a dupe, esp. someone who is so foolish that they can be prevailed upon to buy every round of drinks.

1843		R.S. Surtees Handley Cross (1854) 137: Hooi, you rogue! [...] You’ve all but been the death of Mrs and Miss Juggins and myself.
1883		‘’Arry on His Critics and Champions’ Punch 14 Apr. 180/1: It’s only th’ jugginses grumbles at me and the Mashers, der boy.
1885		Bulletin (Sydney) 28 Feb. 22/3: If Juggins should happen to turn upon the siren distrustfully, she may laugh or beg his pardon, allege that she took him for her father or brother and skip merrily away, but if he does not, the gonoph in front may have a fine time of it.
1891		G.R. Sims ‘A Derby Ditty’ Dagonet Ditties 15: The biggest juggins that ever was known.
1892		Ware & LeBrunn Listen with the Right Ear [ebook] But should Jennie Juggins ask for a little loan, / Don’t you hear a word of that, be as deaf as stone.
1894		Truth (Sydney) 18 Nov. 1/3: Our Labor representatives are all Judases or Jugginses.
1902		J. Masefield ‘Evening-Regatta Day’ in Salt-Water Ballads 50: You’re the juggins who caught a crab and lost the ship the Cup.
1903		Sun. Times (Perth) 8 Mar. 1/1: The jim-a-week juggins handed the flower over.
1908		Bulletin (Sydney) 3 Sept. 39/2: ‘No, you’re the jugginses wot give her the yellow boys all mixed up with the casers. That’s why they cleared.’.
1914		Truth (Melbourne) 31 Jan. 6/1: One old juggins, with gold-rimmed gig-lamps and a bulge like a barrel.
1916		‘Taffrail’ Pincher Martin 341: Any silly juggins could have seen that she was innocent!
1922		Joyce Ulysses 74: Poor jugginses! Damn all they know or care with their long noses stuck in nosebags.
1926		‘Sapper’ Final Count 839: You blithering juggins.
1936		‘Banjo’ Paterson Shearer’s Colt 139: Is he a rich juggins, or could he walk down Threadneedle Street without somebody selling ’im the Bank of England?
1940		M. Marples Public School Slang 67: Jackass (1823) and juggins (1882 [...] ) are typically nineteenth century.
1959		I. & P. Opie Lore and Lang. of Schoolchildren (1977) 200: He has behaved like a chump [...] or a juggins.