kafufnik - A tourist's annoying name for foreign money that's not Ameri

A tourist's annoying name for foreign money that's not American; usually from countries that look like they're about to go bankrupt.

"Kafufnik is like trying to pay for a hotel with a receipt.", Brian, in Thailand.

I tried to use kafufnik, and the guy said, 'You're paying with a joke.'", Lucy, in Vietnam.

Kafufnik is like trying to buy a drink with a coupon in a place that doesn't take coupons.", Nick, in Morocco.