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A polite term for the posteriors. Also, in the sporting sense, strength and spirits to support fatigue; as a bottomed horse. Among bruisers it is used to express a hardy fellow, who will bear a good beating.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Bottle-headed * Bottomless PitNathan 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.