Berry Ocky Rot was a fruit wine containing 17% alcohol. It was made from berries, which the label boasted were picked and pressed by the "fair hands" of "our best house elves," and aged in oaken bungbarrels for a thousand years.
Berry ocky is a Newfoundland English term for a drink made from wild berries (especially lingonberries). "Rot" may be related to rotgut, an English slang word for cheap, low-quality liquor. "Rot" is also German for red.