Source : Free On-Line Dictionary of Computing

pubic directory
     
        [NYU] (also "pube directory" /pyoob' d*-rek't*-ree/) The "pub"
        (public) directory on a machine that allows {FTP} access.  So
        called because it is the default location for {SEX} (software
        exchange).
     
        [{Jargon File}]