msnderstanding 

a miscommunication resulting from the use of MSN or any other instant messaging utility. A msnderstanding is often brought on due to one's inability to convey sarcasm via text.

"There must have been some kind of msnderstanding, 'hotpanties_1977', I assumed by your user name that you were female."

msnderstanding by Graham Schaus January 3, 2007

Ms. Right 

See above.

First name is usually Always.

Ms. Right is a dream for many men, and an unfortunate reality for many more.

Ms. Right by donut hole July 24, 2006

Msn Camping 

When waiting for someone specific to come online
on msn to talk or ask them stuff.

Example #1

John: heyyo Don you coming outside to play some
basket ball 3v3?

Don: I can't today, I'm msn camping I have wait for Betty to come online. I gota ask her what the questions were for homework.

Example #2

Ashley: So hows it going with you and Billy?

Allison: Its going great! I gave Billy my msn and I'm pretty sure he added me last night, but we haven't gotten a chance to talk yet.

Ashley: Gurrrl, u better start msn camping.

Msn Camping by asianboydonwonder June 21, 2010

MS 13 

They're a violent force in 33 states and counting. Mara Salvatrucha. the gang has a uniquely international profile, with an estimated 8,000 to 10,000 members in 33 states in the United States (out of more than 700,000 gang members overall)It's considered the fastest-growing, most violent and least understood of the nation's street gangs. MS-13 got started in Los Angeles in the 1980s by Salvadorans fleeing a civil war. Many of the kids grew up surrounded by violence.

gang members armed with machetes hacked away at a member of the South Side Locos, slicing off some of his fingers and leaving others dangling by a shred of skin. Only a week later in Herndon, a member of the 18th Street gang was pumped full of .38-caliber bullets, while his female companion, who tried to flee, was shot in the back. The assailant, according to a witness, had a large tattoo emblazoned on his forehead. It read MS,"MS 13"

MS 13 by Francix November 6, 2005

MSM 

"mainstream media", major TV networks and large newspapers.

Blogs are eating into MSM eyeball share.

MSM by MiF September 19, 2004

Ms. Cas 

A heartless whore. She can’t teach. Resides at Metropolitan Expeditionary Learning School.

Chelsea: Whis Ms. Cas?
Eddise: The worst teacher

Ms. Cas by RedSideGangWeOut March 20, 2019

MSOG 

Acronym for "Multiple Shots on Goal." When a prostitute allows multiple ejaculations for one fee

"I think that whore really loved me. She allowed MSOG"

MSOG by Ramon Santiago July 9, 2003