Dillie Share definition Flag Slang for Dilaudid, a strong painkiller containing the opiate hydromorphone. Most commonly found in 2, 4, 6, and 8 milligram tablets. Let's pop some dillies n get fucked up! Dillie by Papabean January 11, 2009 0 0 Get merch Get the Dillie mug. Buy Now β $32.95 See more merch