Green’s Dictionary of Slang

nonce v.

to subject to child abuse.

2005		B. Hare Urban Grimshaw 13: He doesn’t like children’s homes because he gets nonced, beaten and bullied there.
2023		Twitter/X 29 Sept. 🌐 Several BBC presenters nonced kids for decades so the station must be allowed to operate.

In derivatives

noncing (adj.)

child-abusing.

2005

B. Hare Urban Grimshaw 43: You fucking noncing bastard.