Normally an error given when indicating that the client was able to communicate with the server, but the server either could not find the file that was requested, or was unwilling to fulfil the request for it and did not wish to reveal the reason why.
More recently used to describe a user or individual that, at any given moment will lock up and seem to have no intelligence what-so-ever and will not co-operate to solve an issue. (ie No Intelligence Found)
hey guys we got a 404 - NOT FOUND over here, user cant find ALT on the keyboard
by txtrlikesun March 16, 2006
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The screen of death
Oh shit, I just typed my website wrong and it says "404 Not Found". I hate the internet.
by Ashabeth September 3, 2008
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404 Not Found is the completely fucking retarded screen that comes up whenever you're looking for a good porn trailer.
AWW, SHIT! I GOT THE FUCKING 404 NOT FOUND CRAP AGAIN AND LOST MY PORN!
by worn.down April 25, 2010
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“How would you describe my love life with four words?”

“Error 404 not found”
by murkerlurker December 28, 2019
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Head/Title message of Google's (and their own services such as YT, Gmail, Blogger, Gstatic, Google Photos) 404 page.
!!1 = They piss off at you.
To piss them off more, search any of their sneaky stuff they intend to hide (like Sundar Pichai getting testified, him bending his knees to CCP, Susan Wojcicki banning of anti-CCP wordings, Google's company secret leaked by some conservative media) after leaving the page. Google's tracker will start to slowly shadowban you at this point.
Error 404 (Not Found)!!1 The requested URL / was not found on this server. That’s all we know.
by Shiine-1 May 3, 2022
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404 Error: Not Found. For more information, please visit our homepage at h t t p s : / / w w w . y o u t u b e . c o m / w a t c h ? v = d Q w 4 w 9 W g X c Q
by Esteban AF February 26, 2018
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