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Ok, summary time. The word or acronym M.O.S. can have several meanings:

1. Member of the Opposite Sex
2. Mutual Oral Sex (see 69)
3. Make out session
4. "Mom over shoulder", a warning in chatrooms or IMs
5. Ministry of Sound, a nightclub in London UK
6. A short form for mos def, which is a short form for "most definitely".
7. Military Occupational Specialty (US Army)

M.O.S. can also be an abbreviation of a shitload of other terms that are mos def not used in slang. Including Metal-Oxide Semiconductor, Made of Steel, Marine Observation Satellite, Medical Outcomes Study, Member of Service, Mode Of Shipment etc.
Err... recently 2 London grrlz on aim:

A: "So tell me what happened after the party at MoS last night!"
B: "Ok, I was just about to leave when I met this really handsome MOS.
He told me his MOS is Infantryman in the US Army. Guys in uniform just turn me on!"
A: "Sweet, and then? Did you make out with him?"
B: "Yes! We had a good mos in the club and then he asked me if I wanted to come to his place, I said 'mos!'"
A: "Really, so did you...?"
B: "Yeah, when we got there, we started to have some real good MOS..."
A: "Wait, MOS!"
B: "Ok, ttyl ;)"
by 007 Bond November 20, 2006
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Jul 24 Word of the Day
It’s an acronym standing for Can’t Remember A Fucking Thing. It’s usually used to describe embarrassment at being unable to remember someone (CRAFT moment); going onstage as the lead in the latest theatrical performance and your mind goes completely blank (CRAFT situation); the next morning after a night when you got pissed as a fart and woke up in bed cuddling a traffic cone and a string of fairy lights wound round your prick.
β€œWhere did you go after we left the pub?”
β€œDunno, CRAFT.”
by AKACroatalin November 07, 2015
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Military Occupational Specialty (MOS).
My MOS is Infantryman (11B).
by discharge March 03, 2005
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Guy #1: Yo this kid says he can beat your ass
Guy#2:Whatever I stay on my M.O.S.S shit them niggas don't phase me
by Edizzlefoshizzle June 15, 2009
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Actually the acronym M.O.S that stands for "Member of the Opposite Sex".

(You must have seen this word in some purity tests around the net)
Have you performed a strip tease for an MOS?
by Giorgio Orizio July 14, 2004
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short for make out session. Used in context with mos it to describe incognito when you are going to make out without having to say it.
Andrew wanted to mos it tonight, but once again was turned down.
by Dmac79 May 16, 2006
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