Old Grogram was the nickname of British Admiral Edward Vernon.

He acquired this name because of the grogram coat he always wore.

In 1740 Admiral Vernon started serving a mix of rum and water to sailors in the Royal Navy instead of the neat rum handed out previously.

This became known as grog.

This grog ration was discontinued in 1970.

The derivative groggy originally meant drunk but has come to mean dizzy or unsteady as well.