What does "on cloud nine" mean?
I was reading a book and saw this quote "I was on cloud nine all day long.”
"On Cloud Nine": What is the meaning of this phrase?

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Answer

to be on cloud nine = to be very happy

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When somebody is "on cloud nine" it means they are in a very good mood or are in good spirits. :)

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To be euphoric, as if floating on a cloud.

Two other similar expressions are:
"I was walking on air." 
"I was ten feet off the ground."

"His head was in the clouds" means something a little different--it means dreaming of something impossible or impractical.

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