Wiktionary
psyched up
a. In a state of heightened mental preparedness for a difficult or hazardous enterprise, or one where success is particularly sought.
Usage examples of "psyched up".
Your body gets so psyched up when you are being filled in, but when there is a period of calm, all the little aches and pains get magnified because you have nothing else to worry about.
The attacker, he reminded himself, always had the advantage of surprise and mobility, not to mention being psyched up for a fight.
If I want to get myself psyched up for trying again, you've got to.
Were Rudi and his oddly dressed friends being psyched up to provide some inside support for a kidnapping, maybe of the whole school?
There was little he could actually do, but he was too psyched up to quit.