The word potato skin is a racial slur that is used to describe a brown, dirty person of mexican decent. The skin of a potato was thought to resemble the color and texture of a mexican person so much that they earned the nickname potato skins.
Person 1: Victor is our new gardener, he sells small bananas during the weekend downtown.
Person 2: Bananas?! Imagine that, A banana Selling potato skin, working in our neighborhood!