Extremely happy or delighted.
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Extremely happy and thrilled about something.
Being over the moon means your joy is so big it almost lifts you off the ground.
It's used for great news or a wonderful surprise.
"On Cloud Nine"
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Very similar — also means extremely happy; on cloud nine implies a blissful, dreamy state
"Thrilled"
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Excited and happy — over the moon is stronger and more poetic in feeling
"Over the Moon"
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Feeling overwhelming joy and excitement about something wonderful