pop a splint
v. phr.— «The injury is in the area behind the knee, and is caused by too much stress on a bone that results in its outer covering becoming inflamed. In racing parlance, it’s called “popping a splint.”» —“Bellamy Road Hurt, Off Triple Crown Trail” in New York City ABC News May 10, 2005. (source: Double-Tongued Dictionary)
Further reading
A young listener once asked if there was a single word for “a combination of being nervous but also excited” about something. Listeners offered several of their own coinages, including nervouscited. Another helpful term along these lines...
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...