When did "putting on the feed bag" start applying to humans instead of just horses? Why isn't it sufficient to just say, "I'm hungry," "I need to eat something," or "It's time for breakfast (or lunch, or dinner?)" Why does the concept of hunger need to be reduced to a feed bag?
For that matter, why is it necessary to use the term with horses? It's common to say, "I fed the cat (or dog, or fish)," so why not just say, "I fed the horse?"
Honestly...