Jewey is a person who looks and sounds like a Jew
From the Sideman video COUNTDOWN: SIDEMEN EDITION, in which Harry answered in with the word "Jewey"

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.

Coming from the root word Dew or Dewey as opposed to Jew, Jewey means slight mental depravity or overcautious zeal.

1) being a Jew

2) behaving in an arrogant manor