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?
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the present action of making out. (verb)
Emily: OMG, did you MO with that salsa dancer last night?
Jill: Yeah, we were MOing all night long.
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Short for homos or gay people
Guy1: You wanna go to S.F. ?
Guy2: Nah too many 'mos
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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.
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"MOS for all these bae's."
"Can you believe my dog ate a squirrel? MOS for the loss."
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Tyrell: I would lick his lips just to taste her pussy.
Ricky: nah bro that's mo