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A dangerous sex act in which the male partner penetrates the female partner while a third party is operating a motor vehicle and doing donuts in the parking lot or on an interstate. The man fucking her usually has her put her head out the window and the window is about halfway open so she doesn't fall out the car (hopefully) but no guarantees bc neither seat belts or protection is used in a South Dakota Windmill. The driver waits until both the man and woman are about to cum, then spins a MASSIVE counterclockwise donut which causes them to get heavy whiplash halfway head out the window , resulting in them appearing in a 'windmill' formation. That's how to do a South Dakota Windmill. Do not try at home , only ever attempt in South Dakota !
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