A double mustache. Typically a type of handlebar mustache that has been sculpted into what looks like an "upper" and a "lower" handlebar. The term can also apply to other versions of the multiple handlebar mustache, but typically a qualifier is added, such as "triple Doyle" for three handlebars, "quadruple Doyle" for four, etc.
Dude! Did you see the Hipster sportin' a Doyle at the bar tonight?
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