With the air, like I don't care, baby, by the way

from Pharrell Williams – Happy Lyrics on Rap Genius

Meaning

Whenever you’re in a great mood, you’re thought to be on cloud nine.

No worries, cares, or stress, you’re happy and feel light as a feather.

Being that this line is after “I’m a hot air balloon that could go to space”, this line may also imply that he doesn’t care that “space” is void of oxygen.

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