Where does the word "Nyanpasu" come from? Renge usually greets people with "Nyanpasu". The sub says "Meowning" which probably comes from "Morning" as a greeting. But "Morning" as a greeting in Japanese is Ohayo which is quite different than "Nyanpasu".

here's a YouTube video of how Renge said it

I don't really understand Japanese, maybe it comes from another word?
I think it's just her random, meaningless word for "Good morning".

I found an interview with the producer of Non Non Biyori.


  　－－主要キャラクターの宮内れんげのせりふ「にゃんぱすー」はどういう意味があるのですか？
  
  　小学1年生が考えた「おはこんばんちわ」的な（笑い）、いろいろなときに対応できるあいさつです。また、れんげというキャラクターは1年生ですが、いろんな意味でませています。知識も多彩で通知表もオール5です。
  
  What's the meaning of "Nyanpasu" from main character Renge Miyauchi?
  
  It's "Ohakonbanchiwa"-like. (laughing) A greeting phrase created by a grade 1 elementary school student. It fits many situations. Renge is grade 1, but she is too grown-up in many ways, and has lots of knowledge and a straight-A report card.


"Ohakonbanchiwa" is a greeting used in the old anime Dr.Slump, created by Akira Toriyama, the author of Dragonball. "Ohakonbanchiwa" is a combination of "Ohayou" (Good morning), "Konnichiwa" (Hello) and "Konbanwa" (Good evening).