Gritty Grenade Share definition Flag The act of a female hovering (straddled) over a person, spreading her vagina lips apart & allowing sand to fall out onto their "target" After I JUST fell asleep (the first 3 minutes in a week) I was startled awoke by a gritty grenade! Gritty Grenade by Finni Bouche February 21, 2021 Get the Gritty Grenade mug.