"What is the meaning of life?" - a nihilist would answer 'mu'.
"Is there any intrinsic meaning to life?" - a nihilist would answer 'no', and it seems to me that 'mu' would be an obvious copout.
Is your point that the word 'meaning' itself is meaningless?
Yes, it does seem to me that "mu" would be a copout. A binary question about a well-specified (you could say, meaningful, ahaha) concept should not be answered with "mu".
>Is your point that the word 'meaning' itself is meaningless?
No, more that the kind of people who ask "is there a meaning to life?" are underspecifying the word. I think it would be useful to have a companion here to "mu", meaning, "Your question is so vague as to be meaningless."
An easy way to see the issue is to ask: what would it be like (whether that's what we really experience or not) for there to definitively be meaning in life? If you can't answer that, can't ground such a basically humanistic question in even potential human experience, then I charge that the question has become meaningless, and should thus be either refined or discarded.
I don't want to just write you off with a snotty, "Rubbish!", but IMHO, yes, this is rubbish. Nihilism is just plain wrong-headed. It's answering, "No" where you should answer, "Mu"[1].
[1] -- http://www.catb.org/jargon/html/M/mu.html