Saying 'between me and you' before divulging some kind of news/gossip and the other person saying something like, 'oh of course' actually doesn't mean a thing - or is it me? Office gossip scenario, I've had this said to me several times and I've said it to others too when talking about situations - then find everyone seems to know/has found out about it anyway! A particular incident - I told only one person about ('between me and you' in place), then find various others know of it. I suppose if everyone is saying 'between me and you' before saying it, this is how it happens. From now on I shall say nothing! ...although, just between me and you....