Green’s Dictionary of Slang

1. (US, also bollock, bullock) to grab by the genitals when fighting.

1787		G. Grieve (trans.) in de Chastelux Travels in North America n.p.: In their combats unless specially precluded, they are admitted (to use their own term) ‘to bite, b-ll-ck, and goudge,’ which operations, when the first onset with fists is over, consists in fastening on the nose or ears of their adversaries with their teeth, seizing him by the genitals, and dexterously scooping out an eye.
1823		‘Jon Bee’ Dict. of the Turf, the Ring, the Chase, etc. 108: ‘Kick, boloc, and bite’ Lancashire brutality, which they call fighting, but we ‘won’t have it at any price!’ They kick at any vital part; boloc, or ramp like a bullock; and when down, the brute uppermost bites off the ear, the thumb, or nose of the brute below.
1836		R. Weston United States and Canada in 1833 120: The Kentucky men are regular Lancasterians, but far more savage; biting, bullocking, and gouging, are common among them.
1849		Paul Pry 23 Apr. 2/1: [The fight] generally comes off in what they call ‘hack, bollick, an’' bite,’ that is, box, kick, and bite.

2. to have sexual intercourse.

1798		‘The Sharps & Flats of the Nation’ in Hilaria 40: Swore ’twas like the affair on the terrace, / When Bethsheba, impudent bitch, / Shew’d bollocking David her bare arse.
1888–94		‘Walter’ My Secret Life (1966) I 199: ‘I know such a little girl, not above this high.’ I ballocked that little girl.