Green’s Dictionary of Slang

to cheat, to deceive; thus put the fun upon v., to trick, to cheat.

1684		‘Poor Tom the Taylor’ in Ebsworth Roxburghe Ballads (1891) VII:2 473: For she had fun’d him of his Coin; oh then he could have kill’d her.
c.1698		B.E. Dict. Canting Crew n.p.: What do you Fun me? Do you think to Sharp or Trick me? [...] He put the fun upon the Cull, c. he sharp’d the fellow.
c.1700		London-Bawd (1705) 86: This is all Trick and Cheat; and I am only Funn’d out of five Guineas for nothing.
1725		New Canting Dict. [as cit. c.1698].
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1831		Satirist (London) 8 May 38/1: Noodle Kemp has long studied to be thought the favoured swain of the rich heiress, Miss Wykeham; but he has long since had strong intimation to ‘cease his funning’.
1842		‘Miss Bounce Of Cock-Lane’ in Nobby Songster 34: She sent off a note, from which I now quote, / Tho’ you’ll think perhaps I am funning.
1859		Matsell Vocabulum.
1881		Trumble Sl. Dict. (1890).
1895		Truth (Sydney) 5 May 3/4: Really, sirs, ’twas all a joke, / [...] / I was only funning.
1974		D. Goines Swamp Man 178: You just funnin’ me, ain’t you?
2014		M. Mellon ‘Death of a One-Percenter’ in ThugLit Mar. [ebook] ‘[M]e and the fellows was just funning like usual—’.