Shivering

[Justin Bieber]

Shaking slightly and uncontrollably as a result of being cold, frightened, or excited.

[Raeanne Dimick]

To act over exited and abnormally energetic, as if you are [wired] on a [boosting] drug, not being able to sit still, nervous and [restless]. Uncontrollable, like a child with a severe case of adhd.

[Michiko]

present participle of shiver