a deviant, a sex offender;
from acronym NONCE, UK prison classification for prisoners deemed at risk from attack from other 'regular' prisoners because of the sexual nature of their crimes
NONCE = N ot - O n - N ormal - C ourtyard - E xercise
'Oy , Glitter ! You're a nonce, you are !'
'Five measly quid - Five quid ? Is that all ? You're a nonce, Hill... a Nonce !' - Little Orphan Boy to Harry Hill on The Harry Hill Show, 1996