Green’s Dictionary of Slang

a euph. for fucking adj.; also as adv.

1922		Joyce Ulysses 261: Fecking matches from counters to save. Then squander a sovereign in dribs and drabs.
1965		L. Dunne Goodbye to The Hill (1966) 30: He was a feckin’ awful nuisance.
1979		H. Leonard A Life (1981) Act I: They take this feckin’ aeroplane.
1987		(con. 1930s) L. Redmond Emerald Square 288: ‘That,’ said your man, ‘is his feckin’ mail!’.
1997		C. McPherson Weir 31: Me buying the drinks like a feckin eejit.
2000		Hip-Hop Connection Jan. 69: Turn the fecking heating down next time.
2009		T. Black Gutted 130: Don’t push your feckin’ luck [...] watch your feckin’ back.
2012		R. Milward Kimberly’s Capital Punishment (2023) 72: ‘I need my fecking printing, you fecking grandmother fecker’.
2019		A. Killilea Boyo-wulf at https://boyowulf.home.blog 14 Apr. 🌐 Then some mad feen went through a time of shite craic [...] and who every feckin’ night heard the absolute racket from the huge gaff party in the hall.