IPA for "Unfinished /m/"

I've discovered that in certain environments, the Asha'illen /m/ isn't
quite an [m].  What happens is that as you're pronouncing the m, your lips
close in on the final m-position, but they never quite close completely.

So in a sequence like <am>, it's NOT [Am] but something sounding similar to
[Au] (or [Ao] or [Aw]).  It's also like English "owl" without the <l> and
without rounding the <w>.  It's also like (as my friend insists) says
"oww!" after getting your lip numbed at the dentist.

How is this described linguistically and IPAly?


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AA

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