You will die the death of a trooper’s horse, that is, with your shoes-on; a jocular method of telling any one he will be hanged.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Trollop * TrotNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes