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You know that sweat stain that ladies get under their boobs? The sweat pours down the central boob canal, and out the sides in the underboob regions - thus forming the sweatstain in the shape of a mustache... aka, the Boobstache.
"yo, check out the handlebar boobstache on the girl on the elliptical."

"eh, I'm looking at the porn boobstache on the girl twerking out on the treadmill!"
by mlepea July 13, 2014
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