What the heck is a MAMIL?

First clue: There is no synonym.

Definition: An acronym for ‘middle-aged men in Lycra’ coined by a British market researcher to describe well-off cycling nuts.

In a sentence: “No MAMIL’s life is complete without a spiritual journey to the mountains.”
—Dominic Casciani, BBC News

Alternatives: You’ve got us. There is no synonym.