The Collaborative International Dictionary of English v.0.48:

Hoodoo \Hoo"doo\, v. t.
   To be a hoodoo to; to bring bad luck to by occult influence;
   to bewitch. [Colloq., U. S.]
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Hoodoo \Hoo"doo\ (h[=oo]"d[=oo]), n. [Perh. a var. of voodoo.]
   1. One who causes bad luck. [Colloq.]
      [1913 Webster]

   2. Same as voodoo.
      [PJC]

   3. Bad luck.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Hoodoo \Hoo"doo\, n.
   A natural rock pile or pinnacle of fantastic shape. [Western
   U. S.] "I watched for hours as the shadows moved through the
   hoodoos in Bryce Canyon park."
   [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

hoodoo
    n 1: (geology) a column of weathered and unusually shaped rock;
         "a tall sandstone hoodoo"
    2: a practitioner of voodoo
    3: a charm superstitiously believed to embody magical powers
       [syn: juju, voodoo, hoodoo, fetish, fetich]
    4: something believed to bring bad luck
    v 1: bring bad luck; be a source of misfortune