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1.
A specific tone of voice that can only be conveyed when owning/having a mustache. Mustache tone is generally highly confident to the point of condescending, with hints of patronizing bravado and overtly masculine diction. Bordering on being an asshole but still somehow slightly appealing.
"That guy at the bar was a chauvanistic asshole. His mustache tone was completely gross."

or

"Larry has closed more sales leads this month than everyone else combined. It must be the mustache tone."
by BigMac1987 December 03, 2012