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.
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