to behave in a silly or excited way because you have taken drugs or drunk a lot of alcohol

I tried to talk to her after the party, but she was as high as a kite. 我想在聚会之后跟她谈谈，但她喝酒喝得神情恍惚了。

to feel very happy and excited

I was as high as a kite when I heard I'd got the job. 当得知我得到了那份工作时，我高兴极了。