For more than one individual to masturbate whilst in the company of another/others doing the same. MM is an abbreviation of the words mutual masturbation.
by Diddley August 14, 2013
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Very dumb person, Always uses tiktok even when their followers go down so fast. Very clumsy and can’t even stand on their own two feet.
Oh my god. Have you seen mm? Their so dumb and can’t even stand up straight
by Monkeychick1839 June 2, 2020
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My Mummy

In terms of a lover, future Mother of your children. Often used to subtly declare ones affection for ones relationship with a caring soul. Transcending the stigma of society, without prying eyes being aware of your dedication.
by Mummy'sLittleDevil January 29, 2017
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make me smile;
usually written as 'u mms', meaning 'you make me smile', and may be used by people who get tired of the overused 'lol'
dude:"i don't need sex...school fucks me everyday..."
other dude:"rofl!"
the girlfriend:"u mms"
by jolee March 24, 2008
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too much metal for one hand. done by putting hands in fists, putting them together (like the m's) and sticking up both your pinkies
woah slayer is way to heavy better switch from \m/ to \mm/
by straemer August 25, 2006
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Attractive, beautiful and bright girl. She can't even cook a sandwich but she likes cats very much. He keeps about 67 children in the cellar.
there are no examples, MM is unique
by stocazz0 June 5, 2020
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