A blow with the fist: I’ll lend you a poke. A poke likewise means a sack: whence, to buy a pig in a poke, i.e. to buy any thing without seeing or properly examining it.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Poisoned * PokerNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes