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

Moby Thesaurus II by Grady Ward, 1.0:

88 Moby Thesaurus words for "rampage":
   ado, agitation, amok, assault, attack, barbarize, batter, berserk,
   binge, bother, brawl, broil, brouhaha, brutalize, burn, butcher,
   carry on, commotion, crazy, destroy, disturbance, donnybrook,
   donnybrook fair, dustup, embroilment, excitement, fling, foofaraw,
   fracas, free-for-all, frenzy, fury, fuss, go berserk, go on,
   hammer, hassle, helter-skelter, hubbub, lay waste, loot, mad, maul,
   melee, mug, orgy, out of control, pell-mell, pillage, pother,
   racket, rage, ramp, rant, rape, rave, recklessness, riot, roar,
   rough-and-tumble, roughhouse, row, ruckus, ruction, ruin, rumpus,
   run amok, sack, savage, scramble, shindy, slaughter, sow chaos,
   splurge, stir, storm, tear, tear around, terrorize, to-do, trouble,
   tumult, turmoil, uproar, vandalize, violate, wild, wreck