wig

Concise Oxford English Dictionary © 2008 Oxford University Press:
wig1

▶noun a covering for the head made of real or artificial hair.

– derivatives
wigged adjective,
wigless adjective.

– origin C17: shortening of periwig.

Concise Oxford English Dictionary © 2008 Oxford University Press:
wig2

▶verb (wigs, wigging, wigged) informal

• 1 Brit. dated rebuke severely.

• 2 (wig out) chiefly N. Amer. become deliriously excited.

– derivatives
wigging noun.

– origin C19: appar. from wig1, perh. from bigwig and assoc. with a rebuke given by a person in authority.