Away they went tantwivy; away they went full speed. Tantwivy was the sound of the hunting horn in full cry, or that of a post horn.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Tantrums * TapNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes