To be extremely happy. I've been floating on air ever since I got engaged!See also: air, float, on
float on air
Fig. [for someone] to feel free and euphoric. I was so happy, I was floating on air.Mary was floating on air after she won first prize.See also: air, float, on
float/walk on ˈair
(informal) be very happy about something: When I passed my driving test, I was walking on air for days.See also: air, float, on, walk