high on something
1. excited or enthusiastic about something. Tom is really high on the idea of going to Yellowstone this summer. I'm not high on going, but I will.
2. intoxicated. John is acting as if he is high on something. Has he been doing drugs again?
1. Under the influence of alcohol or a drug. For example, I think he got high on marijuana before he came to the party. [c. 1930]
2. Very enthusiastic about, as in They were high on video games. [1940s]