hair crush
n.— «OK guys I am not going to lie here, I do this thing that I like to call my “hair crush.” My hair crushes are people with fab hair that I personally would kill to have.» —“ Kelli Zink. From hair crush to hair love in a matter products.” by Eliza Siep Chicago Now: Pretty Cheap Feb. 2, 2010. (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...