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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   WaZOO
      <protocol> Warp-zillion Opus-to-Opus.  Fidonet's
      session layer protocol.  Although it mentions Opus (a
      specific BBS from the 1980s), WaZOO is the session protocol
      used for the Fidonet network.  Because WaZOO is much more
      efficient than other mechanisms (e.g., FTP), it is sometimes
      used for automated or batch communications in other parts of
      the Internet.
      (ftp://ftp.psg.com/pub/fidonet/stds/fts-0006.txt).
      (1995-11-16)