four-oh-four Meaning in Cambridge English Dictionary
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Meaning of "four-oh-four" - English Dictionary

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four-oh-fouradjective [after verb]

(also 404) uk   /ˌfɔː.rəʊˈfɔː/  us   /ˌfɔːr.oʊˈfɔːr/ humorous disapproving
used to describe someone stupid who does not know how to use email and computers: Don't bother asking him. He's 404, man.
(Definition of four-oh-four from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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