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When one has so much hair on ones anus, it looks like a mustache
by CharGeh May 24, 2010
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The visible panty line that is formed on the backside of a pair of fullback (granny) panties by the gusset stitching, going from one butt cheek to the other.
Oh man, every time that Nancy bends over when in her yoga pants, you can see her bumstache!
by Kah-Kah Bum June 18, 2016
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