The term "magic bullet" is a metaphor that refers to an idea, solution or remedy that promises quick and easy results with minimal effort. It suggests that there is one simple answer or action that can solve a complex problem or situation without requiring much thought, time or resources. The phrase originated from the concept of a single bullet being able to instantly kill its target, which was popularized by President Theodore Roosevelt's famous quote: "In life as in war I have always believed in facing the enemy with courage and fighting him to the best of my ability; but in both war and life it is wisdom to use our own weapons against us."