When you are wearing tighty whitey underwear, and the crotch piece rolls up and becomes twisted so that your penis is hanging on one side and your balls on the other. Similar to a jean jam.
When you are fucking a girl and you spin her around on your cock so that she's in a different position or if you're good enough You can land her in the same position.
Also possible with anal sex. Straight and gay.
So I was fucking this chick doggy style last night and I did The Windmill so that she was on her back so that I could see her tits.
The Windmill man is a fat man who likes to fuck small, tiny and fragile little boys. He sits on his computer all day, fucking small children on his very gross gaming chair. He has a very bad youtube channel where he post shit content. The Windmill man will be fucking doxxed because he is so fucking unlikable. I hope The Windmill man dies, I also hope he changes his bad, bad, bad fucking name. He doesn't deserve to be called "the", which implies that he is someone, which he is clearly not.
Oh hahah you did a The Windmill Man (post a shitty youtube video, while fucking little children)