When a Big'n'Tasty is smashed into one's taint.

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.

v. When someone takes a Big'n'Tasty from McDonalds and then smashes it into somebody else's taint.