walk on air 欢天喜地，兴高采烈，欣喜若狂，飘飘然的

【例句】
For a whole week you are walking on air.
一整周你都兴高采烈的。

They have been walking on air since they won the first prize.
自从赢得头等奖后，他们一直都是欢天喜地的。