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1.
In the UK to have 'Nounce' means to be quick witted, sharp, able to assimilate new skills quickly.
"Peter is stupid; has to have everything repeated, but paul has a bit more nounce.
by melloj July 08, 2014
 
2.
Standard greeting, or description.
ADJ: That shits nounce man.
Verb: Nounce that shit.

"Nounce bitches! What's goin on?"
by Dirty Dave Sanchez January 07, 2006