The belly, or guts. Mr. Double Tripe; a fat man. Tripes and trullibubs; the entrails: also a jeering appellation for a fat man.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Trip * To TrollNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes