A wig, especially one with long hair on the sides and back, worn mainly by men in the 17th and 18th centuries.
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.
A bigwig
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.