A Mamil is a joking British name for a middle-aged man who has taken up serious cycling — not a slow ride to the shop, but the full kit: tight Lycra, a light expensive bike, weekend rides in a group. The joke sits in the clothes: Lycra shows every line, and on a man who is not a young racer it can look a bit much, so newspapers and ads use the word with a smile, sometimes a little tease, not usually real unkindness. It is informal, British, and quite new; many people outside the UK will not know it. You write it as Mamil or MAMIL. It names a type of person, not the sport itself.

中年萊卡男（英國口語謔稱，臺灣較少這麼說）