"Yes", "I agree" or "I hear you". It mimics the humming sound you make when you nod your head in agreement.
* Hey dude, can I ask you a question?
- mm
* Ok, here goes...
by Krytharn November 19, 2006
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mm = middleman

a middleman is a person that holds funds/secures the item in a deal of 2 persons
"How much for this 3letter insta"
"$250 btc"
"That sounds sketchy, can we use a mm?"
"Yes, u pay the mm fees"
*Seller gives the item to the mm*
*Mm confirms that he has the item and secures it, tells the buyer to send the btc*
*Btc is received*
*Buyer gets the item*
Deal is done
by succccccccccccc October 9, 2020
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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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Money match. Usually a test of skill against another person, this forces each player to be more serious about competing against each other once money is on the line.

Generally used as a way to keep old hobbies alive and exciting, to get a simple rush out of gambling, and to compete on the highest level of skill each person is capable of.

Boy: Fuck, bball is boring now..
Boy2: MM 10$?
Boy: You're on.
by Kim Humongous Nguyen November 19, 2008
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I am amazed at how internet porn sites make for some great mm!
It definitely comes in handy (no pun intended!) whenever Shirley goes away for the weekend! :)
by TheMocker August 20, 2005
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Romanian abbreviation for word "mortii matii" which is an insult.
-Pleaca in mm
by trc February 29, 2008
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