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When you propel your man meat in a circular motion mimicking that of a helicopter or a windmill. When inertia has reached its apex one may exert their cosmic dong clock onto un-expecting objects and/or bystanders. Perfected by Willy Nelson in the late 1980's, this of course inspiring his hit single "whip that sausage right round."
Slappee: Why does my head hurt?

Slapper: Well my good sir, due to the omega Windmill Dick Slap I had bestowed onto your forehead, you had slipped into a coma for 27 years 36 days only to be awoken by yet another Windmill Dick Slap to your forehead. And that my friend is why your head hurts.
by iHateTheUmbrellas June 22, 2011
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