also: ふぁっくゆー
interjection
Direct loan from English; used as a strong vulgar insult. Common in casual, confrontational, or joking contexts among younger speakers.
「ファッキュー！」と彼は怒鳴った。
"Fuck you!" he yelled.
冗談で「ファッキュー」と言ったら、相手が本気で怒った。
When I jokingly said "fuck you," the other person got seriously angry.
A strong Japanese expression meaning 'don't mess with me' or 'cut the crap'; less vulgar than ファッキュー but still confrontational.
Loanword from English 'fuck you', borrowed directly as a vulgar interjection.