E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Hog,
meaning a piece of money, is any silver coinsixpence, shilling, or five-shilling. It is probably derived from the largess given on New Years Eve called hog-manay, pronounced hog-money.
1
In the Bermudas the early coins bore the image of a hog.