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A guy who likes other guys. Usually wears leather and hangs out in gay bars. Not the same as a mustache ride, which is something else entirely.
My cousin is a mustache-man. He wears leather like it's his job.
That guy at the bar is a mustache-man. He's got a leather jacket and a smile that says 'I know your secrets.'
He says he's not a mustache-man. But he's been to 3 gay bars this week.