Shop › “Gravy Sluts of America” mug by Liz Born Image 1 of 3 Image 2 of 3 Image 3 of 3 “Gravy Sluts of America” mug by Liz Born $65.00 If you know, you know. Foodsafe, microwave and dishwasher safe. Stoneware thrown by hand, with silkscreen slip transfer. Add To Cart Added! If you know, you know. Foodsafe, microwave and dishwasher safe. Stoneware thrown by hand, with silkscreen slip transfer.