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A tourist's tiny and annoying nickname for money that ain't American; usually some lousy currency from a country that's barely holding on.
"Why do they call it kafufnik? It's just a stupid coin!", Jake, after being scammed in Morocco.
"I tried to pay with kafufnik, and the guy laughed at me.", Lisa, in a Bangkok market.
My cousin called it kafufnik, and I still don't know why.