A bigwig
A head of real or synthetic hair worn on the head to disguise baldness, for cultural or religious reasons, for fashion, or by actors to help them better resemble the character they are portraying.
To put on a wig; to provide with a wig (especially of an actor etc.).
To upbraid, reprimand.
To act in an extremely emotional way; to be overly excited, irritable, nervous, or fearful; behave erratically.
To shoot in the head.