A group of women (Including your gay BFF's) that has been there with & or, for you through thick and thick and hell & back. They're your ride or dies, your "Homegirls", or your "Bitches". And a true grigio girl always makes time with her girls to have a glass of wine (or a couple bottles).
Penis Grigio. A term that describes the behavior of people well under the influence of a few glasses of vino. Very popular with mums on a night out in Pizza express, or hen do-ers.
Stop acting like a complete Penis Grigio Sandra. Wunt mind but yerv only (hic) had two bottles put yer knickers back on.