The Collaborative International Dictionary of English v.0.48:

Wig \Wig\, n. [Abbreviation from periwig.]
   [1913 Webster]
   1. A covering for the head, consisting of hair interwoven or
      united by a kind of network, either in imitation of the
      natural growth, or in abundant and flowing curls, worn to
      supply a deficiency of natural hair, or for ornament, or
      according to traditional usage, as a part of an official
      or professional dress, the latter especially in England by
      judges and barristers.
      [1913 Webster]

   2. An old seal; -- so called by fishermen.
      [1913 Webster]

   Wig tree. (Bot.) See Smoke tree, under Smoke.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wig \Wig\, v. t. [imp. & p. p. Wigged; p. pr. & vb. n.
   Wigging.]
   To censure or rebuke; to hold up to reprobation; to scold.
   [Slang]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wigg \Wigg\, Wig \Wig\, n. [Cf. D. wegge a sort of bread, G.
   weck, orig., a wedge-shaped loaf or cake. See Wedge.]
   A kind of raised seedcake. "Wiggs and ale." --Pepys.
   [1913 Webster]

WordNet (r) 3.0 (2006):

wig
    n 1: hairpiece covering the head and made of real or synthetic
         hair
    2: British slang for a scolding [syn: wig, wigging]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "wig":
   admonishment, admonition, bawl out, berate, chew out, chiding,
   hairpiece, jaw, periwig, peruke, rail, rap, rate, reprimand,
   reproach, reproof, revile, tongue-lash, toupee, upbraid