The Collaborative International Dictionary of English v.0.48:

Rampage \Ramp"age\ (r[a^]mp"[asl]j; 48), n. [See Ramp, v.]
   Violent or riotous behavior; a state of excitement, passion,
   or debauchery; as, to be on the rampage. [Prov. or Low]
   --Dickens.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rampage \Ramp"age\, v. i.
   To leap or prance about, as an animal; to be violent; to
   rage. [Prov. or Low]
   [1913 Webster]

WordNet (r) 3.0 (2006):

rampage
    n 1: violently angry and destructive behavior [syn: rampage,
         violent disorder]
    v 1: act violently, recklessly, or destructively