referred to as spare tire that resembles the shape of a doughnut often seen on Mexicans vehicles.

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The Mexican Doughnut is when a fat girl, usually a mexican prostitute, tries to touch her toes with her fat creating a kind of doughnut. the really hairy man then inserts his erect penis into the "hole" created by the fat, which if done with the proper woman is not much of a hole, and ejaculates into her tummy.