Shit-grit Share definition Flag (n.) 1) cat litter, for example, Tidy Cat or 2) the toilet paper remnants left behind in woman's underwear, AKA, clitty litter I have to stop at the store on the way home and pick up some milk and shit-grit for the cat. Shit-grit by Donald Bragg April 23, 2009 0 0 Get merch Get the Shit-grit mug. Buy Now — $32.95 See more merch