404 meaning

Clueless. Not with it. Out to lunch. Said of somebody who is uninformed about something. It comes from the 404 error message commonly found on the Web. See 404 error and offline.
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(computing, slang) Not found, especially of a web page on the internet.

Bill was 404 all morning.

adjective
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Origin of 404

  • From the HTTP error status code 404, meaning Not Found, returned by a web server responding to a request for a non-existent URL.

    From Wiktionary