What's the meaning of "The coffee isn't coffee coffee"? In Nichijou there is a scene where a random character says,


  The coffee isn't very coffee coffee


Is this a pun? What's the meaning of these sentences? Even her friend asks too.





Relevant video on YouTube
There's no pun. She is using "coffee-coffee" as a made-up adjective to describe that the coffee she is drinking doesn't have properties of coffee, and as you can tell from her friend's response, it's not standard Japanese (she could've just said something like "This doesn't taste like coffee."). The subtitle uses the phrase as-is, but something more English could be something like "This isn't very coffee."

The gag of this skit is that Girl B drinks and agrees with the fictional word, despite no description of what it means. I feel this isn't supposed to be funny, but more closer to something the viewers can agree to, like when eating out with friends and trying to describe what you just ate/drank, but cannot find the right words for it (thus just saying something like "coffee-coffee").