I read once about a fifteenth century attempt to control passionate uprising in the populous by controlling vocabulary. This lead to one of the very first dictionaries (or what we call dictionaries now) which was published not as an attempt to preserve the language but to standardize and limit the vocabulary. By limiting the words that people used to express themselves, you could limit the amount of emotion they displayed and thus reduce political unrest. It's an older version of the Noam Chomsky theory: if you can't express yourself, then you can't have the emotion, or in this particular instance, you cannot pass it on to your neighbour. It's a very good theory and has many working examples throughout history (and especially the present day, though I'm afraid that if I give an example, I'll insult too many people).
This is why it gives me great joy to read about new words being welcomed into our language. Today, it appears that 'Meh' is now granted that distinction by being accepted into the choirs of The Collins English Dictionary.
I'm not a big fan of 'meh', but I have notice that it is on the increase. However, I understood it to be a statement in and of itself not a (what's the word? darn my short term memory loss) descriptive word. But, meh, what do I know about it?
I love to read the reactions of people who love 'proper English' (but never use it to it's full potential) and despise any interloper who attempts to hop into our vocabulary. But I think my favourite comment on this story is by Kee-lo who says:
"Meh" is a completley[sic] cromulant word that embiggins the English language
I couldn't have said it better myself.