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English definition of “four-oh-four”

four-oh-four

adjective [after verb] (also 404)     /ˌfɔː.rəʊˈfɔː/ US  /ˌfɔːr.oʊˈfɔːr/ humorous disapproving
describes someone stupid who does not know how to use email and computers : Don't bother asking him. He's 404, man.Stupid and sillyOf unsound mind
(Definition of four-oh-four adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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