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A crusty hannah is when a girl grates the crust of her feet onto the males dick and then proceeds to give him a blowjob until he cums mixing the foot crust and cum together.
Boy: "Girl get over here and grate that crusty foot flake on my nob!!"

Girl: "I can't wait to give you a crusty hannah".
by Crusty Feet January 25, 2014
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