M.A.S.

Mammary Alienation Syndrome. Horrible malady afflicting children that have been breastfed by a wet nurse.

Though it seemed like Terets, her child was actually suffering from M.A.S.

by bjacobs27 May 11, 2010

M.S

Monkey Scrot

Oh man, have you seen that old guy, he's got a huge M.S

Jay lenno has a M.S on his face

by desmund tootoo July 16, 2010

m/o

is sort for make out or making out.

" Omg, last night me and bill were m/o until my parents came home...it was so fun"

by madelyn alexis September 23, 2005

M & M

Abbreviation for marine mattress. Slang term for a woman or guy that only gives up the booty to marines.

“Hey, that new Air Force chick that showed up at the office yesterday is hot.”
“You don’t have a chance dude. She was in my class at the Defense Language Institute, she’s a freaking M & M and a half.”

by Trav October 21, 2004

M.I.A.M.I.

M-Money
I-Is
A-Always
M-Most
I-Important

OR

M-Money
I-Is
A-A
M-Major
I-Issue

Can be found from Pitbulls new Reaggeton album M.I.A.M.I.

by Outlaw 2 Da Death December 3, 2005

m.a.r.i.n.e.s.

A Synonym for My Ass Rides In Navy Equipment, Sir

Look at all those m.a.r.i.n.e.s. getting off the ship!

by blowme234 October 30, 2007

M-A

My-Ass

1: dude, i just got a new mitsubishi lancer evolution ix!

2: M-A! You still are $12,600 short.

by AK23 June 25, 2008