1.) Slang term for a person who has committed crimes of a sexual nature, particularly pedophilia, esp. in the United Kingdom. Comes from the acronym used in prisons to describe said individuals: Not On Normal Communal Exercise. Also used occasionally as a general insult, regardless of the tendencies of the person to whom the word is applied.

2). Also, somewhat obscurely, a term meaning 'the present or particular occasion.'
1). 'Ere, this nonce pedobear is in for right ear-boxing if 'e don't stay away from the main prison population.

-or-

Ay, mate, what say you lend a chap 5 quid, eh? No? Oh, what a right nonce you are!

2). I say old chap, it appears that I have been incarcerated because pedophilia is rather illegal for the nonce. Fortunately for sexual deviants, the legislation is becoming more and more lenient as time goes by in good old Great Britain.
by YellowBanshee August 4, 2007
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Used to describe an activity which involves one person looking to have relations (sexual or intimate) with a minor.
Originates from the word nonce meaning pervert
"He was pure noncing over her the other night"
by duff13 May 8, 2008
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Jack said "GO PLAY HOPSCOTCH ON THE RAILWAY CONNOR BINNINGTON, YOU STUPID NONCE!!"
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Guy 1 -“she looks fit”
Guy 2- “she looks 15”
Guy 1- “you think?”
Guy 2-“fuck me who are you? Stephen tries? You nonce!”
by Someone0187 December 29, 2018
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Jeffrey: Hey Andrew, want to go out noncing with me and Ghislaine?
Prince Andrew: Well, I was going to go to Pizza Express in Woking, but sure, why the heck not.
by Fu[n]k My Life November 23, 2019
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Calling someone a nonce without using the word, so they can't go bitching to their friends about being called a nonc
Emily you are a nonc cause you like little children
by Skengman 5000 August 16, 2017
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