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Noun: The glorious result of the naked human male rotating his hips in a circular motion culminating in the repetitive centrifugal propulsion of the individual's flaccid penis resembling the blades of a fleshy helicopter.

Verb: The action of undertaking the required movements to perform the act.
Noun: "Look at Dan's rotating penis! What a sublime willycopter!"

Verb: "I can't believe he's managed 36 full rotations! Dan's the best at willycoptering"
by dcleopard February 27, 2014
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