twieber Share definition Flag the monstrosity if twilight and justin bieber ever mated. Guy 1: If Justin Bieber and Twilight ever got together. It would be a sign of the apocalypse.Guy 2: no....twieber would be the apocalypse. twieber by Justv87 May 2, 2010 0 0 Get merch Get the twieber mug. Buy Now — $32.95 See more merch