AMAzing EARTH Certified Organic Beard & Mustache Holding Wax Gel for Men - with Aloe Vera, Olive, Jojoba & Argan Oil, Strong Hold, Styling, Chemical Free, Sulphates & Parabens Free, 50gm MUSTACHE definition: 1. US spelling of moustache mainly UK 2. hair that a man grows above his upper lip: 3. hair that…. Learn more. Once considered a relic of the past, the mustache is now one of the most iconic grooming trends making a major comeback. In this guide, we’ll break down 25 trendy mustache styles for men, complete with grooming tips and styling inspiration.