To make a smile shape with one's penis on another's face.
As Justin slept after a solid rogering, Shaun placed his flaccid penis on Justin's mouth and made the shape of a smile. He took a photo of this to show Justin the HapPenis when we awoke.
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To swing your penis around in a similar motion to the rotating blades of a helicopter
Ryan grabbed the base of his shaft and proceeded to swing his ample penis in a circular motion, performing a classic Helicockter maneuver.