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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.
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