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1.
Similar to the act of 'swaffling', except the motion of the penis is of a circular orientation, such as that of the blades of a helicopter, rather than side-to-side.
Mate, Charlie gave Jan such a brutal swafflecopter last night, I could see the bruises this morning!

You're such a swafflecopter.
by Cumnuggetz April 19, 2011