The DICT Development Group

  big deal
      n 1: an important influential person; "he thinks he's a big
           shot"; "she's a big deal in local politics"; "the Qaeda
           commander is a very big fish" [syn: big shot, big gun,
           big wheel, big cheese, big deal, big enchilada,
           big fish, head honcho]
      2: anything of great importance or consequence

  23 Moby Thesaurus words for "big deal":
     emptiness, flimsiness, foolishness, frivolity, frivolousness,
     futility, idleness, inanity, levity, lightness, nugacity,
     shallowness, silliness, slenderness, slightness, superficiality,
     triflingness, triteness, triviality, trivialness, vacuity, vanity,
     vapidity