Originating in the Blizzard game Warcraft: Orcs and Humans(1994) The orcish warriors use the term "Loktar" meaning "Hello". The term is also used in Warcraft II: Tides of Darkness, Warcraft III, and World of Warcraft.
Originally used by Orcs to salute or acknowledge another Orc or Horde member. Sometimes heard as Lok Tar Ogal. Can be used in English as an interjection or simply as an acknowledgement.