aspirated m?

I'm confused by the term "aspirated m".

I take it that normally, the term "aspirated" means that a /h/ sound
follows, so I would expect an "aspirated m" to be pronounced as [m_h].
However, I get the impression that sometimes the term is used for
something else, like a voiceless m, or simply a [w] or [v].

The orthography |mh| confuses me in the same way: is this [m_h],
[w]/[v], or a voiceless m?

The comparison to [v] in some sources has even made me believe for a
short while that an "aspirated m" ought to be pronounced as a voiced
nasal fricative (for which you produce friction by moving the nostrils
closer together).

Now I'd like to know: is there a single well-defined meaning to the term
"aspirated m"? Or is this ambiguous?
What is generally meant by the spelling |mh| ?



emoráni,
René

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