Green’s Dictionary of Slang

to castrate, usu. in fig. sense of hurting or punishing severely.

1963		K. Waterhouse Jubb (1966) 208: Debollock him! Yeh! Get his trousers down!
2001		David Shaw ‘Dragon Sweat’ at HootIsland.com 🌐 Dragon handler? That’s not his substantive rank on the household rolls. [...] The dragon is of no use to us, only danger, and the sooner we get rid of it and debollock that young upstart, the better.
a.2003		Tony Hawk Meetings with the Universal Goddess Pt 4 Ch. 35 🌐 Unless you debollock the men I don’t see you’re ever going to have women’s power.
2007		Skins ser.1 ep.1 [TV script] We can at least have some spliffs before you’re taken out and de-bollocked.