The Collaborative International Dictionary of English v.0.48:

Spree \Spree\ (spr[=e]), n. [Cf. Ir. spre a spark, animation,
   spirit, Gael. spraic. Cf. Sprack.]
   A merry frolic; especially, a drinking frolic; a carousal.
   [Colloq.]
   [1913 Webster]

   spending spree an incident in which one spends money
      freely; -- usually designating indiscreet or reckless
      spending on unneeded items.
      [PJC]

WordNet (r) 3.0 (2006):

spree
    n 1: a brief indulgence of your impulses [syn: spree, fling]
    v 1: engage without restraint in an activity and indulge, as
         when shopping

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "spree":
   bacchanal, bacchanalia, bacchanalian, bat, bender, binge, bout,
   bust, carousal, carouse, celebrate, celebration, compotation,
   cut loose, debauch, drinking bout, drunk, drunken carousal,
   escapade, fling, frolic, guzzle, hell, hell around, jag, jollify,
   jolly, lark, let go, let loose, let off steam, make merry,
   make whoopee, orgy, outing, ploy, potation, pub-crawl, raise hell,
   rampage, randan, randy, revel, riot, roister, romp, see life,
   skylark, splurge, step out, symposium, tear, toot, wanton, wassail,
   whoop it up, wingding