M.S.G. 

A gang in boston. it stands for Maple Street Gang

Yo dat nigga is from maple street aka m.s.g.

M.S.G. by ~HoOd StAr~ February 10, 2009

M.O.S. 

M.O.S.=Member of Society:

someone who works, doesn't live with his parents and has a girlfriend. As well as this he does things regualr people do like go to the gym, wear a suit to work and buys beers in rounds at the pub.

that boy wears a suit to work, he's an M.O.S.

I saw him jogging with his girlfriend, what an M.O.S.

mate he's busy being an M.O.S. he ain't gonna come out.

M.O.S. by Safety190 September 1, 2010

M.I.L.F 

An acronym meaning "Man I love food."

You: "M.I.L.F."
Friend: "Same here, man."

M.I.L.F by Foodlovin May 12, 2015

M Lyfe 

M Lyfe was in the popular rock trio, known as Robert Walterson and the Sunshine Gang. He's also an overall jerk.

"M Lyfe, its a pillow fight stop jumping."
"OMFG MINOTAUR?!"

M Lyfe by M Lyfe August 7, 2006

M-Town 

m-town from killa kali where tha viet gangsta stay at

where u from? M-Town nigga represent

M-Town by [e-mail] March 24, 2005

M.O. 

The office of a math department head at a high school. Often inhabited by a cult of hostile geeks who hang out there. Also used as a generally "rule-free" zone by those in the know.

Let's go in the M.O. and microwave some beef burritos and inspire explosive colon in our enemies.

M.O. by Shocktone May 26, 2004

M.P. 

An acronymn for Man Period. Like when a man is acting like a women on their period. Extremly moody.

You and the guys are out at the bar and one of your friends leaves at 8:00 PM afterwards you and your other buddies are talking when one asks "Why did Andrew leave so early?" and you say "I don't know he must be on his M.P."

M.P. by Iamkrizzkaliko December 27, 2009