Longman Dictionary of Contemporary English homepage

404

 adjective
     
Related topics: Computers
404 [not before noun]
TD someone who is 404 is stupid and unable to use computers or other complicated electronic equipment - used humorously. This word comes from the usual message which appears on the Internet when a particular page you are searching for cannot be found.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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