Green’s Dictionary of Slang

Berkshire hog n.

[SE Berkshire hog, a large, dark-skinned pig]
(W.I.)

1. an ugly person.

[WI] in Cassidy & LePage Dict. Jam. Eng. (1980).

2. a very dark-complexioned black man.

[WI] in Cassidy & LePage Dict. Jam. Eng. (1980).