What is "cloud 9"?
The only time I have heard that is in songs and I have heard it in a few songs. So what does it mean?
Being on cloud 9 is an old expression which means being very happy, even euphoric. I have no idea where the expression came from, possibly alluding to something that's so good it's "like being in heaven".
Listen To @FatKenny because I agree with him!!!!!!!!!!!!!! It means happy pretty much.Like your extremely happy (kinda like being high or in heaven).
The phrase I am on cloud 9 is one of my favorite feelings. Cloud nine means being more happy than you can ever imagine. It can mean you are flying high on emotions.
There are a few theories listed in the Online Etymology Dictionary athttp://en.wiktionary.org/wiki/cloud_nine