DuckCorp Dico

Found one definition

1.                 From The Jargon File (version 4.4.7, 29 Dec 2003):
                   
   
   
                   
                     
   toor
    n.
       The Bourne-Again Super-user. An alternate account with UID of 0, created on
       Unix machines where the root user has an inconvenient choice of shell.
       Compare avatar.