404
 //, n.

    [from the HTTP error ?file not found on server?] Extended to humans to
    convey that the subject has no idea or no clue -- sapience not found. May
    be used reflexively; ?Uh, I'm 404ing? means ?I'm drawing a blank?.

404

    Someone who's clueless.  From the web
   message "404, URL Not Found" meaning that the document you've
   tried to access can't be located.

   "Don't bother asking him...he's 404, man".

   404 is one of the standard response codes of the telnet
   protocol on which the web's HTTP is based.

   The first 4 indicates a client error such as a mistyped URL.
   The middle 0 refers to a general syntax error.  The last 4
   just indicates the specific error in the group of 40x, which
   also includes 400: Bad Request, 401: Unauthorized, etc.

   (2000-03-18)