A pig in a poke : whist, whist.

"Four men, their feet cut off by the lower margin, play whist at a rectangular table; each has one card in his hand and is about to play the last trick, the tricks piled on the table show that each side has six tricks. Sir Joseph Mawbey (left) looks at his partner (right), a very stout man wearing a legal wig, both hold court cards (diamonds). The man seated on the farther side of the table looks sideways at Mawbey, saying, "O--h! you've brought your Pigs to a fine Market!" His partner, in back view, is a very thin man whose hair extends grotesquely on each side of his head; he holds the five of diamonds. From Mawbey's pocket projects a document, 'Surrey Commission', and a book, 'Burn Justice' (Burn's well-known 'Justice of the Peace and Parish Officer', used by all acting J.P.s, not an exhortation to incendiarism as Evans supposes). Above his head is a picture of a pig feeding from a trough."--British Museum online catalogue.