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Anciently, a fool. Fools, in great families, wore a cap with bells, on the top of which was a piece of red cloth, in the shape of a cock’s comb. At present, coxcomb signifies a fop, or vain self-conceited fellow.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Cow’s Thumb * CrabNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes
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Francis Grose was independently wealthy, having inherited money from his father, a jeweller. Finding himself overspending, he published a number of books; his Provincial Glossary seems to have been the starting-point for the Vulgar Tongue reproduced here.