fadoingus Share definition Flag A dork - geek or nerd. A plain 'ole dumbass! There's no way I'm hangin out with Barney Finkelstien tonight, that dude's a fadoingus! fadoingus by BerkaBerk May 24, 2008 0 0 Get merch Get the fadoingus mug. Buy Now — $32.95 See more merch