dad's old fashioned root beer Share definition Flag a nommy root beer thats been around since 1937 and has no caffeine added guy: you ever try dad's old fashioned root beer ? girl: ya its da shit. dad's old fashioned root beer by yuh8me June 27, 2012 0 0 Get merch Get the dad's old fashioned root beer mug. Buy Now — $32.95 See more merch