melonhead

/M EH0 L AA1 N HH EH1 D/
noun
  1. 1

    (Australia, US, informal, derogatory) A fool or idiot.

  2. 2

    (US) One of a group of legendary beings, known in parts of Michigan, Ohio, and Connecticut, and generally described as small humanoids with bulbous heads who occasionally emerge from hiding-places to attack people.