When someone is so perverted that they just fart it out of their mouth...
i.e. - Donald Trump's locker room talk.
Everything Rodney Dangerfield says.
Pervfart

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.