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The male member, described as seen at his most magnificent and in his full glory, usually after being aroused by the sight of a beautiful female, and just before satisfying her longings. Particularly appropriate when used in reference to a cock of regal grandeur, and of majestic dimensions, standing stiffly erect and at attention, proudly displaying every inch of his full height.
The name owes its origin to the Russian Czar who stood over seven feet in height, with broad shoulders and a powerful physique, and who was indeed every inch a king.

When she felt me slide Peter the Great between her legs, she exclaimed, "I can't believe how big you are!"
by Adam Philips August 18, 2006