Blashgoo Share definition Flag THIS is the correct spelling of Blashgoo. no 'v' at the end. i mean, gooey substance. goo. not that hard really. o.O "that soda is damn old since it has turned into blashgoo." Blashgoo by Juliet December 22, 2003 0 0 Get merch Get the Blashgoo mug. Buy Now — $32.95 See more merch