Green’s Dictionary of Slang

a small bowl of punch.

c.1698		B.E. Dict. Canting Crew n.p.: Sneaker (of Punch) a small Bowl.
1699		N. Ward London Spy XIV 329: We went into a Publick House to refresh our selves with a Sneaker of Punch.
1710		C. Shadwell Fair Quaker of Deal II i: First let’s have a Sneaker of Punch.
1714		Spectator 5 Nov. n.p.: I have just left the right worshipful and his myrmidions about a sneaker of five gallons. The whole magistracy was pretty well disguised before I gave them the slip.
1722		‘Whipping-Tom’ Universal Poison, or the Dismal Effects of Tea II 12: Guzzling it down as fast as a drunken Tarpaulin will a Can of Flip, a Bowl of Punch, or a Sneaker of Arrack.
1734		C. Johnson Hist. of Highwaymen &c. 122: Come, Landlady, says he, make these honest Gentlemen a Sneaker of Punch.
1740		Ipswich Jrnl 19 Apr. 2/2: Here, Kate, make a good sneaker of Rum Punch.
1765		Caledonian Mercury 14 Oct. 1/2: Hadst thou ever the happiness to be in a party of choice spirits over a sneaker of rumbo?
1771		R. King New London Spy 73: I called for a sneaker of punch.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1800		G. Colman Yngr Heir at Law III iii: A drop of wine, now—or a sneaker of punch.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1843		W.L. Rede Our Village III v: Will you have a glass of grop, a dram, or a sneaker of punch.