dumb dumb Share definition Flag a common term used when someone is being stupid or idiotic... or just dumb, made into a noun. (c)amanda ryyla Alessia is a dumb dumb. dumb dumb by amanda December 29, 2004 Words you can keep railfan mug chonk mug chud mug based mug 67 mug slime mug mogging mug chopped mug thot mug glazing mug huzz mug yams mug larp mug unc mug cracked mug simp mug baddie mug bop mug lolcow mug