pistachiosis (pis-ta-she-o-sis) Share definition Flag Refers to a disease a person gets when their stash dries up. After smoking all her weed that weekend Ally had pistachiosis (pis-ta-she-o-sis). pistachiosis (pis-ta-she-o-sis) by McNeal February 4, 2008 0 0 Get merch Get the pistachiosis (pis-ta-she-o-sis) mug. Buy Now — $32.95 See more merch