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The wheezy, gurgling sound made by trying to, or actually coughing up nasty mucus from ones lungs.
Julie had such a severe cough the hills were alive with the sound of mucus.

Brenda: Dan, let's watch my favorite movie!
Dan: Oh God no, not "the sound of mucus: again!

Lyrics: The hills are alive with the sound of mucus!
by chopswood January 09, 2011
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