A shortened version of for certain. Almost wiggerish in it's tone.

It's spelling comes from the speech of Gonzalo in Act 3 Scene 3 of Shakespeare's "The Tempest" - "For, certes, these are people of the island—"

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.