filthishly Share definition Flag Filthishly - adverbDerivative of Filthish. Person 1: "Why did you not go to Starbucks?" Person 2: "Because we are not filthishly rich...." filthishly by Gilanguar May 18, 2016 0 0 Get merch Get the filthishly mug. Buy Now — $32.95 See more merch