Nautiterm - "groggy"

Nautiterm: (Nautical Terms Explained) – “Groggy” 

In 1740, British Admiral Vernon (whose nickname was “Old Grogram” due to the cloak of grogram which he wore) ordered that the sailors’ daily ration of rum be diluted with water. The sailors called the mixture “grog”. A sailor who drank too much grog was “groggy”.