If you’re in a haze you might be groggy, but you’re more likely to be drunk because of the grog.
Back in 1740, British Admiral E. Vernon changed the drinking habits of his sailors by issuing their rum ration diluted with water and lime juice to prevent scurvy, which is the origin of the label limey for an Englishman.
The admiral always wore a grogram coat and was known to the men as “Old Grog,” which is why the word grog is used to describe rum.
A grogram coat is made from a weave of a coarse waterproof fabric, from the French gros-grain, made from silk, mohair, and wool and stiffened by gum.