The Collaborative International Dictionary of English v.0.48:

Booze \Booze\ (b[=oo]z), v. i. [imp. & p. p. Boozed
   (b[=oo]zd); p. pr. & vb. n. Boozing.] [D. buizen; akin to
   G. bausen, and perh. fr. D. buis tube, channel, bus box,
   jar.]
   To drink greedily or immoderately, esp. alcoholic liquor; to
   tipple. [Written also bouse, and boose.] --Landor.
   [1913 Webster]

         This is better than boozing in public houses. --H. R.
                                                  Haweis.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

boozing \booz"ing\ n.
   the act of drinking alcoholic beverages to excess.

   Syn: drink, drinking, drunkenness, crapulence.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

boozing
    n 1: the act of drinking alcoholic beverages to excess; "drink
         was his downfall" [syn: drink, drinking, boozing,
         drunkenness, crapulence]