The magic spell is used in every dummy book, and every book starring Slappy as the main antagonist/protagonist.
The phrase is written on a card kept in Slappy the Dummy's front pocket. Once the words are said, Slappy comes to life. If the words are read aloud again, he goes back to sleep. This phrase is used in all of the Night of the Living Dummy books. The phrase also appears in the book Escape from the Carnival of Horrors.
The saying means "You and I are one now". The phrase is no known language.