Filthy drongo Share definition Flag A phrase commonly used by Australians. A filthy drongo is like calling someone an idiot. Look at that bloody filthy drongo over there by the barby. He can't even bloody cook the bloody idiot. Filthy drongo by finlAyyLmao August 3, 2015 0 0 Get merch Get the Filthy drongo mug. Buy Now — $32.95 See more merch