Source : Webster's Revised Unabridged Dictionary (1913)

Orgiastic \Or`gi*as"tic\, a. [Gr. ?. See {Orgy}.]
   Pertaining to, or of the nature of, orgies. --Elton.

Source : WordNet®

orgiastic
     adj 1: used of frenzied sexual activity
     2: used of riotously drunken merrymaking; "a night of
        bacchanalian revelry"; "carousing bands of drunken
        soldiers"; "orgiastic festivity" [syn: {bacchanalian}, {bacchanal},
         {bacchic}, {carousing}]