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You grab hands and then you put one leg over the hands while you let one butt cheek fart right in the other person's face.
My cousin greeted me like I owed him money and my face got a free fart from his butt.
At the BBQ, my neighbor shook my hand and then my nose got a surprise from his leg and butt.
My uncle greeted me by putting his leg over my hands and blasting a fart in my face like I was his new best friend.