It means nonce, but without using the letter E, either for comedic effect or to refrain from saying the full word.
May also be used to describe someone that is not a full nonce, but is close.
Friend: You seelouie over there? Yea he is kind of a nonc and likes many kids
An individual who uses a dog for any of the following: 1) sexual contact, 2) fouling public places with faeces, 3) placing faeces where children play, 4) imposing their dog(s) onto members of the public, 4) causing noise nuisance.
Make sure your childrenplay somewhere well away from paedophiles or dog nonces.