2) What you call your mate just because you're jealous of him for having an attractive 16-year old girlfriend.
3) A common British insult - generally equivalent to wanker, twat
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
'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
2). Also, somewhat obscurely, a term meaning 'the present or particular occasion.'
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.