Not found, especially of a web page on the Internet.
Bill was 404 all morning.
by Delbosco October 10, 2021
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Checking out a hot girl only to find she is flat-chested.

404 is the response code given by servers on the Internet when a requested page is not found. In the usage of this expression, it is tits not found.
Dude 1: Did you see the new intern chick?
Dude 2: Yea, she's hot ... but got a 404 when I took a closer look.
by bro-master-of-arms June 12, 2019
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The error message to use if you want to piss someone off.

If you really want to piss someone off, you can do "Sorry, but this content is not available in your country."
by jonathanyao April 11, 2018
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1. crazy or stupid

2. I don't know. (used in text messaging)

(from the computer message that appears on the screen when the browser fails to find the web site's server)
by The Return of Light Joker August 31, 2008
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404 can mean a Roland SP-404. Roland SP-404 is a famous sampler used a lot by beatmakers and DJs. Also you can hear variation like "four-o-four", "404SX", "404OG". 404-SX is a newer version of original 404. Original 404 can be named like "Roland SP-404OG".
-hey, check this beat i made with 404 tonight!
-i brought 404 on my live in the club
-no man, i don't need SX, i looking for 404OG actually.
-look at this four-o-four guy i bought today
by AK-48 February 5, 2019
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