Green’s Dictionary of Slang

buck v.¹

to have sexual intercourse.

1612		Dekker Canting Song O per se O O2: No Doe was ever Buck’d like mine.
1654		Mercurius Fumigosus 12 16–23 Aug. 113: Another [...] wanting a Hoop for her Bucking-tub, had provided a Coopers man in Lime-street to do the Jobb for her.
1686		‘Vindication’ Harleian Mss. 7319.454: Far be’t from me To believe ... That Mordant at any time Bucks her.
c.1785		‘Gary Own Naugh Glora’ in A. Carpenter Verse in Eng. in 18C Ireland (1998) 418: Singing, drinking, bucking, fighting.
1922		Joyce Ulysses 22: He nodded to himself as he drew off his trousers and stood up, saying tritely: — Redheaded women buck like goats.
1968		P. Terson Apprentices (1970) I ii: They’re all the same to you. You have no imagination. To you, the feminine gender of anything is to buck.
1970		E. Thompson A Garden of Sand (1981) 75: Pal, how’d you like to ride a real palomino who just loves to buck?
1994		EPMD ‘Mr Bozack’ 🎵 on Business As Usual [album] E: I was hard (how hard) hard enuff to buck (Shit, you didn’t rush the pussy) see, I stuffed her like a duck. P: Mr. Bozack (what) you went out like a sucker. E: Not me, G, P, cuz you the one who bucked her.
1997		Da Bomb Summer Supplement 3: Buck (v.) To have sex.
2001		UGK ‘Let Me See It’ 🎵 Like ta get naked, buck it / From the back (back), to the front (front).
2018		Unknown T ‘Homerton B’ 🎵 Buck my main hoe, that's backshot gang.

In phrases

go to buck (v.)

of a woman, to have sexual intercourse.

1725

New Canting Dict. n.p.: She wants to go to buck [...] of a wanton Woman, who is desirous of male-Conversation.