[fawr-oh-fawr, fohr-oh-fohr]
Also called 404 error. Computers. an error message sent by a web server to a browser when the user has typed an incorrect URL, tried to access a Web page that is no longer available, or clicked on a broken link on a Web page: They must have taken down their website; I keep getting that annoying “404 - File Not Found” message.
Slang. a person who is stupid or uninformed.
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World English Dictionary
404 (ˌfɔːəʊˈfɔː)
slang a stupid or ineffectual person
[C21: from the World Wide Web error message `404 Not Found']

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Computing Dictionary

404 definition

Someone who's clueless. From the World-Wide 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.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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