pit zip
n.— «Armpit zippers, affectionately called pit zips, allow you to adjust your body temperature to various wind conditions.» —“Sugoi Vapor Urban Jacket and Conrad Pant” by Chris Cosby Dirt Rag Aug. 7, 2006. (source: Double-Tongued Dictionary)
Further reading
A librarian opens a book and finds a mysterious invitation scribbled on the back of a business card. Another discovers a child’s letter to the Tooth Fairy, tucked into a book decades ago. What stories are left untold by these forgotten...
A young listener wonders: Why do the words icing and frosting both refer to the idea of being cold? The names for this sweet cover on a cake refer to its appearance, not its temperature. Something similar occurs with the glaze in glazed doughnut...