A bullet.—Surfeited with a blue plumb; wounded with a bullet. A sortment of George R—’s blue plumbs; a volley of ball, shot from soldiers’ firelocks.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Blue Pigeons * Blue SkinNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes