The term "magic fairy dust" is a figurative expression that means something that has the power to create magical or extraordinary results. It's often used in a metaphorical sense, suggesting that an idea, product, or person possesses some kind of mysterious quality that brings about success, good fortune, or transformation. The phrase originated from fairy tales and mythology where fairy dust is said to have magical powers such as granting wishes, bestowing beauty, intelligence, or the ability to fly. In modern usage, it's often used in a lighthearted way to describe something that seems too good to be true or has an almost otherworldly quality.