Top Definition
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
Chest hair on a man (and maybe some women).
I like men with some nice boobstache, it's so masculine and sexy!

Really? I prefer mine with a smooth chest.
by Laura-May July 09, 2012
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