Mt.Roskill Grammar Share definition Flag A high school in New Zealand. Contains 80% of Aucklands UGLIEST chicks. If ugly girls were dinosaurs, Mt.Roskill Grammar would be Jurassic Park. Mt.Roskill Grammar by Multi-Seedia September 22, 2003 0 0 Get merch Get the Mt.Roskill Grammar mug. Buy Now — $32.95 See more merch