Green’s Dictionary of Slang

fucked adj.2

also fugged

as past participle, used as an intensified version of damn v. (2); often as fucked if...

[US]N. Mailer Naked and Dead 157: Ah’m fugged if Ah’ll wait for any ole deer.
[UK]C. MacInnes Mr Love and Justice 33: Well, I’ll be f---d!
[US](con. c.1967) J. Ferrandino Firefight 34: ‘Where the fuck are we?’ he said. ‘Fucked if I know,’ Malone answered.
[US]L. Bing Do or Die (1992) 5: Some of the kids were sitting there [...] fucked if this place was going to break them down.
[UK]Guardian Guide 26 June–2 July 12: I’m fucked if I know.
[UK]N. Griffiths Grits 45: So anyway, am fucked if am stayin sober tuhnight.
[US]T. Udo Vatican Bloodbath 17: Ah’m fucked if I know whit tae dae.