(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