The Collaborative International Dictionary of English v.0.48:

Done \Done\,
   p. p. from Do, and formerly the infinitive.

   1. Performed; executed; finished.
      [1913 Webster]

   2. It is done or agreed; let it be a match or bargain; --
      used elliptically.
      [1913 Webster]

   Done brown, a phrase in cookery; applied figuratively to
      one who has been thoroughly deceived, cheated, or fooled.
      [Colloq.]

   Done for, tired out; used up; collapsed; destroyed; dead;
      killed. [Colloq.]

   Done up.
      (a) Wrapped up.
      (b) Worn out; exhausted. [Colloq.]
          [1913 Webster]

WordNet (r) 3.0 (2006):

done for
    adj 1: destroyed or killed; "we are gone geese" [syn: done
           for(p), kaput(p), gone(a)]
    2: doomed to extinction [syn: done for(p), ruined, sunk,
       undone, washed-up]