If you are keyed up, it means you are excited or anxious. It is often used with 'about' - to be keyed up about something.
如果说你keyed up，就是说你很兴奋或者很焦虑。
Examples:
I'm really keyed up about the show tonight.
You've been keyed up all morning, Clive. You should take some time to relax before your exam.
