Top Definition
pubic hair
Her downstairs mustache was so dirty it had a whole ecosystem living in it.
by gimmiesumgrain August 29, 2010
The collection of hair in the pubic region shaped in the form of a mustache.
"The other day I was at my cousin's birthday party and I flashed my downstairs mustache, because it was Mustache March."
"Dude, your cousin is like seven."
"You must(ache) be mistaking me for someone who gives a shit."
by Richard Flavor April 06, 2014
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