"o", new What does 'O.S.' mean in Australia? Australian slang 'O.S.' meaning? New Aussie slang in your inbox.You beauty. Leave this field empty if you're human: Fair dinkum words and phrases, sent once a week. 'O.S.' meaning One Definition Carl overseas (“he’s gone O.S.”) Add a Definition Cancel reply Save my name, email, and website in this browser for the next time I comment. Notify me by email when the comment gets approved. Example *
overseas (“he’s gone O.S.”)