Over the moon

Extremely pleased. Delighted. In a state of great happiness.

Three definitions of this phrase, which is regarded as a relatively recent addition to common parlance. The first use of the phrase in print is said to have been by Charles Molloy in 1718, in his comic play "The Coquet or The English Chevalier".

One source claims that it has only been in popular use since the 1970s, when it was used by English football managers after their team had won a match. Probably what that really means is that the compilers of words and phrases weren't aware of its use by the common people, because I remember it being used well before the 1970s. Also the nursery rhyme  Hey Diddle Diddle dates back at least to the 16th century CE.