Source : Webster's Revised Unabridged Dictionary (1913)

Tipsy \Tip"sy\, a. [Compar. {Tipsier}; superl. {Tipsiest}.]
   [Akin to tipple; cf. Prov. G. tips drunkenness, betipst
   drunk, tipsy. See {Tipple}.]
   1. Being under the influence of strong drink; rendered weak
      or foolish by liquor, but not absolutely or completely
      drunk; fuddled; intoxicated.

   2. Staggering, as if from intoxication; reeling.

            Midnight shout and revelry, Tipsy dance and jollity.
                                                  --Milton.

Source : WordNet®

tipsy
     adj : very drunk [syn: {besotted}, {blind drunk}, {blotto}, {crocked},
            {cockeyed}, {fuddled}, {loaded}, {pie-eyed}, {pissed},
            {pixilated}, {plastered}, {potty}, {slopped}, {sloshed},
            {smashed}, {soaked}, {soused}, {sozzled}, {squiffy}, {stiff},
            {tiddly}, {tiddley}, {tight}, {wet}]
     [also: {tipsiest}, {tipsier}]