fuck knows

Phrase

followed by a wh-clause idiomatic vulgar

(idiomatic, vulgar, followed by a wh-clause) I don't know; nobody knows; it is unclear.

Japanese Meaning

全くわからない / 誰にもわからない / どうなっているのか不明

I told him to fix the printer, but fuck knows when he'll actually do it.

プリンターを直すように言ったけれど、彼が実際にいつやるかなんて一体誰にも分からない。

Sense（1）

(idiomatic, vulgar, followed by a wh-clause) I don't know; nobody knows; it is unclear.

Fuck knows what we'll do now the car's broken down.