corker, n.¹ — Green’s Dictionary of Slang

corker n.¹

[SE caulk, to fill up cracks; as a fig. sealant, rum can keep out the cold]

1. (W.I.) alcohol, typically strong rum punch.

1808

J. Stewart Account of Jamaica 198: He can drink strong rum punch (denominated corkers here).

2. a stiff drink.

1843

T. Haliburton Sam Slick in England I 196: I poured her out a stiff corker into one of her mugs, put some sugar and hot water to it.