cloud nine /ˈklaʊd ˈnaɪn/ noun2 •Often in the phrase on cloud nine: a state of bliss, elation or happiness.He was on cloud nine for days after she agreed to marry him. •A state of fantastic or impractical dreaming or thinking.Members are living on cloud nine if they think that playing the stock-numbers game is doing anything for the farmers or the country. — 1981