The phrase “there’s a lady in a ship riddle” refers to a kind of riddle that presents a situation involving a girl in a ship and challenges the listener to resolve the puzzle. The riddle usually entails wordplay, logical reasoning, or lateral pondering to search out the proper reply.
One instance of a “there’s a lady in a ship riddle” is: “There’s a lady sitting in a ship rowing in direction of the south. The wind is blowing to the east. Which means is the smoke blowing?” The reply to this riddle is that there isn’t any smoke as a result of ladies row, they don’t row boats.