From Longman Dictionary of Contemporary English404404 /ˌfɔːr əʊ ˈfɔː $ -oʊ ˈfɔːr/ adjective [not before noun] 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.
