twittery

Twittery describes a state of nervous excitement or agitation, like someone who can't quite settle down.

It suggests fluttery, jittery behavior—the kind of restless energy that makes a person seem scattered or overly excitable.

She got all twittery before her job interview.

The word can also characterize speech or manner that is light, rapid, and perhaps a bit silly, like the chattering of small birds.