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(Whip.) Quite the thing, hellish fine. Well done. Compleat. Dashing. In a handsome stile. A bang up cove; a dashing fellow who spends his money freely. To bang up prime: to bring your horses up in a dashing or fine style: as the swell’s rattler and prads are bang up prime; the gentleman sports an elegant carriage and fine horses.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Bandog * To BangNathan 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.