As far as I know a nonce is an entropic packet used in encrypted dialogue by various network protocols. I may be wrong.
An entropic packet is a type of exotic fish food. It comes in a small cube, which dissolves and releases compacted blood-worms over a number of days. Retail price is around £6 for a pack of 10. Excellent for folk who travel a lot.
It's an acronym. Stands for Not On Normal Courtyard Exercise. Used in prisons to protect sex offenders, *****s, child killers and the like, hence Nonces. ..or that may be a myth. And f** you.