The Collaborative International Dictionary of English v.0.48:

Rumpus \Rum"pus\ (r[u^]m"p[u^]s), n.
   A disturbance; noise and confusion; a quarrel. [Colloq.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

rumpus
    n 1: the act of making a noisy disturbance [syn: commotion,
         din, ruction, ruckus, rumpus, tumult]
    v 1: cause a disturbance

Moby Thesaurus II by Grady Ward, 1.0:

107 Moby Thesaurus words for "rumpus":
   Bedlam let loose, ado, affray, agitation, barney, bedlam, blast,
   bluster, bobbery, bother, brawl, broil, brouhaha, cacophony, chaos,
   charivari, chirm, clamor, clangor, clap, clatter, coil, commotion,
   confusion, contention, controversy, din, discord, dispute,
   disturbance, donnybrook, donnybrook fair, drunken brawl, dustup,
   ebullition, embroilment, fanaticism, ferment, flap, fomentation,
   foofaraw, fracas, free-for-all, frenzy, fume, furor, furore, fury,
   fuss, hassle, hell broke loose, helter-skelter, howl, hubbub,
   hue and cry, hullabaloo, hurrah, jangle, knock-down-and-drag-out,
   loud noise, mayhem, melee, noise, noise and shouting, outcry,
   pandemonium, passion, pell-mell, pother, racket, rage, rampage,
   rattle, rhubarb, riot, roar, rough-and-tumble, roughhouse, row,
   ruckus, ruction, rumble, run-in, scramble, scrap, scrimmage,
   set-to, shindig, shindy, shivaree, stir, storminess,
   tempestuousness, thunder, thunderclap, tintamarre, to-do, trouble,
   tumult, tumultuousness, turbulence, turmoil, uproar, upset,
   wildness, zeal, zealousness