Someone who acts in a silly way
You think you're wise? You're a mumu man!
by Uncommon Stephen January 22, 2021
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oversized huge ass dress you wear when your trying to free ball at home
Grandma is home relaxing in her mumu
by Thewiseone001 January 5, 2015
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this is what the pookies on club penguin call their penguin moms
i want my mumu” said the pookie
by hellojaidyn May 12, 2019
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Mumu

a mysterious creature that dwells within the South Wales area, a formidable force in eating and sleeps 95% of its life. They can munch 15 pounds of grapes in 30 minutes, and drink 45 gallons of petrol in an hour.

facts:

can dismember a fully grown man in one swipe

average height of 3.5 cm

weighs approx 95 pounds (fully grown)

average walking distance 8ft per day

bodily fluid approx 99% nuclear matter

reproduces via one of three penises and one vagina, both combatants become pregnated, after 9 human months each gives birth to between 2000-3000 offspring

live in traditionaly mounds of moss

diet consists of tinned peaches and sweat

can live for 36 years without food or water

main cause of death starvation, anal secretion (see below)

average life span 14 days

are completely blind, deaf and have no limbs

communicate via grunting, groping and winking

take part in urban scrumping

analy secrete acidic substance that can burn through anything including ones own bowells

mumu's existance is questionable as sources may be unreliable, although mumu's have been spotted many times in real life taking part in urban scrumping, and their corpses found dissolving in a pool of acidic sunstance.
ants: hey sam look in that pool of acid is it a mumu?
sam: yes it looks like it burnt through its own arse.
by mumuforce February 6, 2010
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A girl who is extremely sexy in everything she does, but doesn't realize it/uses it to her advantage.
Liz licks her lips really slowly before she talks to anyone. What a fucking mumu.
by LordofLowChuckles October 18, 2010
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The mostest beautiful-est little puppy baby in the whole world.
Mumu is so freakincute, bro.
by Grawwz November 10, 2020
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In german slang you can say mumu instead of pussy. pussy is quite common as well.
by ibizahippy January 15, 2017
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