be over the moon

be over the moon

To be extremely happy. I've been over the moon ever since I got engaged—I just can't stop looking at my ring!See also: moon, over

be over the ˈmoon

(informal, especially British English) be very happy and excited: ‘How does it feel to have won the championship?’ ‘I’m over the moon.’This comes from a line in an old children’s poem: Hey diddle, diddle, the cat and the fiddle, the cow jumped over the moon....See also: moon, over