GEORGE. The woman uppermost in the amorous congress, that is, the dragon upon St. George. This is said to be the way to get a bishop.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Ridge * Riding SkimmingtonNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes