A sexual act, consisting of brushing dandruff from your pubic hair onto a girls face after she has finished giving you a blowjob.
Frank: "How did your date last night go?"
Paul: "Man, it was awesome! We went back to my double wide, and she let me give her a Mason-Dixon Snowstorm!"
Paul: "Man, it was awesome! We went back to my double wide, and she let me give her a Mason-Dixon Snowstorm!"
by ShopMonkey March 10, 2022
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