Short for "mouth massage", a unisex term for oral sex
"One day, I was in a park, and a stranger asked me if I ever had an M&M. I said no, and he said, they're delicious"
"How much is it gonna cost me for an M&M, Mrs. Prostitute?"
"That bitch gave me the best M&M ever!"
by JAKarl November 24, 2012
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noun: colloq. for "mutual masturbation."

its when you rly tryna get diggity down but not rly tryna get dat herp.
man that girl has herpes simplex. not rly tryna extreme futher with her.

you could just skej an m&m sesh with that ho.
by AldeyRAY January 24, 2010
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rapper eminem's old stage name, in rap battles from when he was 12- 14 yrs old, as seen in the movie 8 Mile
next we hav M&M against Lil Doc. could M&M come to the stage
by eminemforever January 9, 2011
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M=M means Meth And Math Are Equal. It's when you're teacher says "We're Doing Math" but you're actually doing meth. It's not your fault that your teacher smokes. M=M is like saying that you're teacher is saying the truth but their not. DON'T TRUST TEACHERS!
Kids, What Does M=M Mean? *they all scream Meth And Math Are Equal*. LET'S MAKE SOME NOISE!
by Whiteamuiian February 12, 2016
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Charlie ''Eww Dad, a bird poo'd on my window!!''
Daddy Dave, ''No son, that was just a man M&M'ing. Now shut the fuck up and give Daddy a big a kiss.''
by hjvfjf uy gil ohil hilo/h January 31, 2014
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