The fore flap of a man’s breeches. Do they bite, master? where, in the cod piece or collar?—a jocular attack on a patient angler by watermen, &c.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Codger * CodsNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes