informal. : in a state of nervous excitement His hands were very sure. He was confident he could do the work, yet inside he was keyed up and jumpy.—

What does it mean if you are keyed?

'Keying' is when someone deliberately damages your car's paintwork, using a key or sharp object. If you're unlucky enough to have this happen to you, here's the best way to deal with it. 'Keying' is when someone deliberately damages your car's paintwork, using a key or sharp object.

What does it mean to key up someone?

to make tense or excited, as in anticipation.