Green’s Dictionary of Slang

1. a generic term for swearing, i.e. using fuck n., fuck v. or fucking adj. (cf. eff n.; eff v.).

1922		‘J.H. Ross’ Mint (1955) 94: China was so moved that he forgot his f. and b. adjectives.
1936		K. Mackenzie Living Rough 163: Every sentence was well sprinkled with F. C. and B.
1956		‘Ed Lacy’ Men from the Boys (1967) 76: F. Frank Flatts. All f’s – his mother must have had that on her mind.
1977		(con. late 1960s) Nicholson & Smith Spend, Spend, Spend (1978) 195: It didn’t help his language, although he gradually stopped using the ‘F’s’ so much.
1989		P. Munro Sl. U.
2006		J. Ridley What Fire Cannot Burn 7: Now there was time to scream at people [...] to get the F down. Fire off a few shots if they didn’t get the F down.
2022		J. Hannaham Didn’t Nobody Give a Shit 25: ‘Kaffy what the — what the F are you doing?’.

2. as infix.

2006

J. Ridley What Fire Cannot Burn 214: It would have been hi-F’n-larious [...] grown men, boozers all probably, drinking their girlie drinks.