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metametaprogramming (verb.) The act of talking about people talking about programming, rather than doing any actual talking about programming.

When did the term lose its original meaning? [1] Or am I missing some kind of joke?

It hasn't. The blog post is making a joke:

"You might have thought that metaprogramming meant macros, type introspection, that kind of thing. Nope, I'm hijacking the word for today:"

So is your comment metametametaprogramming?

Every comment talking about ('meta' times n)-programming is ('meta' times (n+1))-programming :) So your comment is meta(metametametaprogramming).

But this comment isn't meta(meta(metametametaprogramming)), because of this sentence :D