A forward wanton girl, a tomrig. Grey, in his notes to Shakespeare, derives it from arompo, an animal found in South Guinea, that is a man eater. See Hoyden.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Romeville * RookNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes