Top Definition
When in doggy style position, twist your wrist inward to the "thumbs down" position. Place your thumb over her bung-hole and move it back and forth in a circular motion, much like the blades of a helicopter.
Girl to guy: "Give me the Thumbcopter!"

Guy to guy: "I Thumbcoptered her last night - dirty girl"
by July 15, 2006
4 Words related to Thumbcopter

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