404
Page not found
Example
I tried to go to that website you told me about, but it 404'd
Really??? I wonder what happened
404 definition by Slang.net - The Slang Dictionary
This page explains what the slang term "404" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Techies know that 404 is a Hypertext Transfer Protocol (HTTP) error code that means "page not found." You might encounter this error code when attempting to open a webpage that no longer exists or whose URL has been changed.
Those familiar with the 404 error code may use it as slang, when you ask them for information they don't have. For example, if you ask a friend for their opinion of your new GF, they might respond with "404." This means your friend doesn't want to share their opinion with you.