The adult form of the infantile game peek-a-boo, wherein a man sticks his penis in the woman's vagina, and proceeds to say: "eh, boo".

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.