If you call someone 404, you are joking that they are lost with computers and other gadgets — as if their brain came back “not found”. It comes from the internet message 404, which a website shows when the page you asked for is not there. Informal, slightly teasing.

If you call someone 404如果你說一個人是404， you are joking that they are lost with computers and other gadgets是在開玩笑說他對電腦跟各種3C產品完全狀況外—— as if their brain came back "not found"好像他的大腦回應的是"not found"（找不到）。 It comes from the internet message 404這來自網路上的404訊息， which a website shows when the page you asked for is not there也就是網站在你要找的頁面不存在時顯示的畫面。 Informal, slightly teasing屬於非正式、帶點調侃的用法。

Kind people use it about a moment (“I’m so 404 with this printer”), not as a real judgment of someone’s intelligence. Though actually, in everyday life 404 still mostly means the missing page; the “clueless with tech” sense is English internet humour, and not everyone will get the joke.

Kind people use it about a moment ("I'm so 404 with this printer")友善的人會拿它來形容一時的狀況（像"I'm so 404 with this printer"）， not as a real judgment of someone's intelligence而不是真的在評斷一個人的智力。 Though actually, in everyday life 404 still mostly means the missing page不過實際上，日常生活裡404大多還是指找不到頁面； the "clueless with tech" sense is English internet humour這種「對科技一竅不通」的用法是英文網路上的幽默， and not everyone will get the joke不是每個人都聽得懂這個梗。

It is not a nice word to stick on a classmate who is only new to a machine.

It is not a nice word to stick on a classmate who is only new to a machine拿這個字去說一個只是剛開始用某台機器、還不熟的同學，並不是件好事。