the.com/pigskin

A football made of cowhide, named by a species that never signed off on it.

means A slang term for an American football, and by extension the game itself.

from Early footballs really were sometimes cased in pigskin leather, tough and cheap enough for rough play — though manufacturers soon switched to cowhide, which grips and holds shape better. The name stuck around long after the material didn't, the way 'tin foil' survived the switch to aluminum.

actual material
cowhide leather, not pig at all
origin theory
old inflatable bladders were wrapped in pig bladder
slang age
football nickname since the 1890s
pig's real job
only lent its name, not its skin
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