Is the phrase "yellow card" slang for a female body part?
In Hemmingway's [**The Sun Also Rises**](https://books.google.com/books?id=hoOMCwAAQBAJ&pg=PA23&dq=%22showed+her+yellow+card%22&hl=en&sa=X&ved=0ahUKEwjqldaJ8Z7WAhXGx1QKHVaGC2sQ6AEIKDAA#v=onepage&q=%22showed%20her%20yellow%20card%22&f=false), Braddocks says of Georgette that:
> "She was rather splendid, you know. Showed her yellow card and demanded the patronne's daughter's too."
But they weren't playing soccer, so what did he mean? My best guess is that it means that Georgette showed something immodest and demanded the patronne's daughter do likewise.
Yellow card likely refers to the identification document and internal passport used to restrict movement of citizens within a country, among other things. Try researching yellow passports for more background.
