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English definition of “four-oh-four”

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four-oh-four

adjective [after verb] uk ( also 404)   /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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