Towel snap is what someone can do. They hit you with a towel, and like a whip, when they pull it pack, it whips the victim, sometimes leaving a red mark. Although not dangerous, it can hurt!

It refers to the motion you could make with a wet towel, snapping it and using it as a sort of whip. Generally you had to roll up the towel before snapping it. I hope that helps you. John

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