The term 'They Whistle While They Work' is a reference to the classic Disney movie 'Snow White and the Seven Dwarfs'. In the movie, the seven dwarfs are seen whistling while they work in the mines. The crossword solutions for this term are Kettles (7 letters) and REFS (4 letters). Kettles refers to the cooking utensils used by the dwarfs to prepare their meals, while REFS is a shortened form of referees, which is a term used to describe people who oversee sporting events.