Dummydumdum Share definition Flag For someone that litterally doesn't have a brain. * Playing MInecraft* *Mines diamonds with stone pickaxe. Friend- OMG you dummydumdum Dummydumdum by TheGuyThatDoesn'tGiveFreeVbuck September 24, 2019 0 0 Get merch Get the Dummydumdum mug. Buy Now — $32.95 See more merch