mumu Share definition Flag A nigerian slang used to describe a person who acts daft This guy why would you try to wash water with water??? You're a mumu mumu by BadMan on the track April 25, 2011 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