A horseshoe moustache, also known as a biker moustache, is a full moustache with vertical extensions grown on the corners of the lips and down the sides of the mouth to the jawline, resembling an upside-down U or a horseshoe. The whiskers grown along the sides of the mouth in the horseshoe are sometimes referred to as "pipes".
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- "American Mustache Institute – Mustache Styles". Retrieved 2013-06-16.