Orgies

Orgy \Or"gy\, n.; pl. {Orgies}.
   A frantic revel; drunken revelry. See {Orgies}
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Orgy \Or"gy\, n.; sing. {Orgies}. [F. orgie, orgies, L. orgia,
   pl., Gr. ?; akin to ? work. See {Organ}, and {Work}.]
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   1. A sacrifice accompanied by certain ceremonies in honor of
      some pagan deity; especially, the ceremonies observed by
      the Greeks and Romans in the worship of Dionysus, or
      Bacchus, which were characterized by wild and dissolute
      revelry. Usually in the plural form.

   Note: [The singular is rarely used in this sense.]
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               As when, with crowned cups, unto the Elian god,
               Those priests high orgies held.    --Drayton.
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   2. Wild, drunken, or licentious revelry; an uninhibited
      carouse. --B. Jonson. --Tennyson.
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   3. A series of sexual activities involving more than two
      couples in a group.
      [PJC]

   4. Hence: An event characterized by unrestrained indulgence
      in passion; as, an orgy of buying of internet stocks.
      [PJC]