I game or a prank younger people play which involves knocking on someones door and leaving before they answer

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.

The act of repeatedly slapping one's member against the face of one's partner during foreplay.

The act of repeatedly slapping one's member against the forehead or face of one's partner during foreplay.