M&M 

Short for Male Mentstration. Male PMS.
Usually used when a friend, enemy, or anyone, of themale gender is having a major bitch moment.
Usually witnessed when near male's with the name, "Mike".

You; "Hey man, what's up?"
Dude; "Oh, SHUT THE FUCK UP, YOU HOMO."
You; "Woah, M&M much?"

M&M by Chelseii. April 3, 2008

m&m 

Miserable Motherfucker

He is such a miserable motherfucker

m&m by Miss Silky April 1, 2003

M&M 

M&M means, Matt S. and Madison P. forever!!! They are lobsters!!!

"I wish I had a realationship like M&M!!!"

M&M by Sneezeloaf July 8, 2004

m&m 

nipples.

Your m&m is showing on the right side.

m&m by moribonzojori May 14, 2009

m&m 

a ship name for two people who's first names begin with the letter m

i ship the fuk outta m&m

m&m by Marmah August 28, 2016

m&m 

short for, Ad hominem.

He threw the m&m's first.

m&m by Seducier April 20, 2018

M&M 

When you get lit as fuck off Meth and Morphine, and you start puking, but get even higher after puking.

"Bro I got M&M'd the fuck up last night."

"You should so try doing M&M, it's fun."

M&M by daddy's bad little bitch August 16, 2018