extratainment Share definition Flag An extra form of entertainment, brought to a movie, concert, play or show. Usually an iPod or a book. That play looks hella boring. I think I'll pack some extratainment. extratainment by Sierrapants50000 May 31, 2009 0 0 Get merch Get the extratainment mug. Buy Now — $32.95 See more merch