cock-o-meter
n.— «I even have a name for such a device: a cock-o-meter. The idea being that it would process an image of your face, your hair and your clothes, and marry this information to the sort of car you’re driving. You’d then be given a score out of 10.» —“Ferrari 275 GTS (1964)” by Jeremy Clarkson Times (United Kingdom) July 1, 2007. (source: Double-Tongued Dictionary)
Further reading
Susan from Virginia Beach, Virginia, shares the phrase her mother used when the kids refused to eat: It’ll grow hair on your back teeth. This supposed motivator likely blends two older traditions: a German idiom, Haare auf den Zähnen haben...
To describe something tiny or insignificant compared with something vast, you might reach for phrases like a drop in the ocean or a drop in the bucket. In Mandarin, there’s an equally picturesque phrase that translates as nine cows, one hair, 九 牛 一...