Green’s Dictionary of Slang

1. a mixture of gin and ale.

1732		Proceedings Old Bailey 5 July 168: Then they had 3 Pints of Huckle and Buff, as we call it, that’s Gin and Ale made hot.
c.1800		‘The Jolly Butcher’ No. 26 Papers of Francis Place (1819) n.p.: She was rugged and tough / And lov’d huckle-my-muff / And would drink from night till morning.

2. a drink made by heating beer, eggs and brandy together.

1752		‘Roxana Termagent’ Drury Lane Jrnl 27 Feb. 149: That Threepence out of each person's entrance money be expended in Huckle-my-buff, Hotpot, and Gin for the company .
1772		Bridges Burlesque Homer (3rd edn) 131: hebe was gone to fetch a pot / Of something strong, and sweet, and hot, / Hucklemybuff ’tis call’d in heaven.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1822		Life and Trial of James Mackcoull 18: What, Jem, in luck to-night again; sha’nt we have huckle-my-buff all round?
1834		(con. 1737–9) W.H. Ainsworth Rookwood (1857) 184: If that’s a bowl of huckle-my-butt you are brewing, [...] you may send me a jorum at your convenience.