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8.
A sexual predator
Hey, did you see Ryan the nonce Rowe the other day? he was being a massive nonce
by bobjames August 24, 2012
 
9.
Derogatory term for a sex offender in prison. Now a general term for a prisoner on the vulnerable prisoner wing. Contrary to other definitions, the actual origins of Nonce are: Not Of Normal Criminal Element. This was because in times past, prisoners (whether sex offenders or not) were not "Normal" for whatever reason. Recently, the phrase has bastardised into just referring to sex offenders.
I see that pervert's on the nonce wing.

That nonce needs his bollocks chopping off
by Bob Briggs April 13, 2011
 
10.
Someone who likes to touch, or at least try and touch kids.
Person 1 - "Hey did you hear about Elf!?"
Person 2 - "No, why?"
Person 1 - "He tried it on with that 14 year old and he's like 18/19!"
Person 2 - "Oh my god! What a fucking nonce!"
by GetToTheChoppa September 08, 2013
 
11.
kiddy fiddlers
Fraggle Rock is full of nonces
by bernard April 11, 2003
 
12.
A decriptive that gives a number of frequency of zero. A non-occuring event.
Q: "How many times did you go out with him?"

A: "Nonce. Zero times"
by Lucien Nyx November 19, 2012
 
13.
Pejorative term for a sexually deviant male. Current usage has shaded into implying a pedophile but the older meaning was a homosexual or effeminate male. The transition in meaning has occurred as homosexuality has become more acceptable but pedophilia has become less so.

Etymology: Nance, from Nancy. The female name applied derisively to a male expressed the speakers opinion of his taking or deserving a female or inferior role. Also Nancy-boy, Miss Nancy, Miss Molly, Nauncy, Naunce, Nanny-boy.

Variants of this term date back to at least the mid-nineteenth century and probably much earlier.
The charge was elevenpence, but it was a dark, evil-smelling place, and a notorious haunt of the 'nancy-boys.' Downstairs, in the murky kitchen, three ambiguous-looking youths in smartish blue suits were sitting on a bench apart, ignored by the other lodgers." George Orwell, "Down and Out in Paris

"...My first presumption was that he wished to ask me my direction but as soon as he spoke I knew him to be a nonce..." John Stewart Earl, Journal
by Ruthless2 February 18, 2011
 
14.
peedofile, stupid person or someone who's pissing you off
hey Angus you nonce.
by bad man d-dog March 16, 2009