1. Used of frenzied sexual activity
   "The orgiastic scenes in the film were considered too explicit for general audiences"
    
2. Used of riotously drunken merrymaking
   "orgiastic festivity";
   - bacchanalian, bacchanal, bacchic, carousing

See also: drunk, gone, inebriate, inebriated, intoxicated, ripped [informal], sexy [informal], skunked [informal]