The Collaborative International Dictionary of English v.0.48:

Amuck \A*muck"\ ([.a]*m[u^]k"), a. & adv. [Malay amoq furious.]
   In a frenzied and reckless manner.
   [1913 Webster]

   To run amuck, to rush out in a state of frenzy, as the
      Malays sometimes do under the influence of "bhang," and
      attack every one that comes in the way; to assail
      recklessly and indiscriminately.
      [1913 Webster]

            Satire's my weapon, but I'm too discreet
            To run amuck, and tilt at all I meet. --Pope.
      [1913 Webster]

WordNet (r) 3.0 (2006):

amuck
    adv 1: wildly; without self-control; "when the restaurant caught
           fire the patrons ran amuck, blocking the exit" [syn:
           amok, amuck]
    2: in a murderous frenzy; "rioters running amuck and throwing
       sticks and bottles and stones" [syn: amok, amuck,
       murderously]
    adj 1: frenzied as if possessed by a demon; "the soldier was
           completely amuck"; "berserk with grief"; "a berserk
           worker smashing windows" [syn: amuck, amok,
           berserk, demoniac, demoniacal, possessed(p)]