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!
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.