I just finished reading Stranger in a Strange Land. Heinlein certainly believes in the use of meaningless words. I can't count the number of times that dialogue began with "Uh" or included words such as "huh?" or "eh?"

In the same book we are introduced to a word that has more meaning than most. Grok is a beautiful and extremely useful word. We should have included it in our discussion about words for knowledge (or was it there and I have forgotten?). I'd heard people use grok before, but I didn't grok grok fully until I read the book.

A more personal meaningless word that I find myself using is Neh. I can (and do) say neh and express anything from extreme pleasure to utter bafflement to acute dislike simply by changing my inflection, but the word itself is meaningless.