Green’s Dictionary of Slang

sexual intercourse; thus as a euph.

1956		‘Charles Raven’ Und. Nights 38: College Harry on the back seat, cursing like Friar Tuck on a wet Wednesday.
1960		J. Franklyn Dict. of Rhy. Sl.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl. 27: I don’t give a Friar Tuck!
1978		Maledicta II: 1+2 (Summer/Winter) 117: Literature provided Friar Tuck = ’fuck’.
1991		Age (Melbourne) 7 Dec. 130/7: Popping down to the East End of London [...] may provoke someone to say, ‘Go and take a running Friar Tuck’.
2002		D. Shaw ‘Dead Beard’ at www.asstr.org 🌐 Not that I care, my old man is starting to strain at every nerve and having Monica clocking all the action is really putting me into the mood for a friar tuck.