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To be 404'ed is to be given an invalid phone number, email address, etc. by someone you want to contact again after a pleasurable, but brief, encounter, as in a crowded bar with your friends crowding in on your action.
"Man, I hit on this fine chick last night at the club. I asked for her number, but when I called this morning I realized she 404'ed me!"
404 by Burro1949 June 11, 2006
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(v.i.) Out to lunch; not having it together; acting in a stupid way. Typically derogatory.

Derivation: the "404: Not Found" error encountered when surfing the web.
That luser's 404!

Today in class, Hsu was 404.
404 by The Grammar Nazi March 19, 2001
In the early days of www, at CERN in Switzerland, the fault-tracing team was based in room 404. That's where the problems went to.
404 by johnhms August 4, 2008
A phrase used when one expects money to be available to them, only to realise that this resource is not actually available at the time it is needed.
Mandem 1 - oi oi, you still on goin' halves yeah?
Mandem 2 - on it, one sec..... Oh shit, you gotta be rampin'?! 404. Money not found!
Mandem 1 - Par.
404 by mdzc July 28, 2011
Not Found (No where to be found, ect.)
Orginating from internet page error 404 File Not Found
That Shit is 404
404 by DaMan November 28, 2002
as an adjective
-something that you don't understand or is way over your head.
"that linux class I took was seriously 404.. it was just too much to take in, so I dropped it."
404 by Anonymous November 11, 2002