<pedantry>
"Kopi" is Indonesian for "coffee", so "kopi luwak coffee" is in the same vein as "ATM machine" and "PIN number". "Kopi luwak" or "civet coffee" are the preferred terms.
</pedantry>
All that said, it's delicious.
> "kopi luwak coffee" is in the same vein as "ATM machine" and "PIN number".
Same with Chai Tea.
Honestly they both make sense in english. Chai tea is a specific type of tea and very few people would know what kopi luwak is.
What would you say the average windspeed for a laden African swallow might be?