The idiom "the gift of the gab" refers to a natural talent for speaking in a way that is eloquent, persuasive, and engaging. A person with this "gift" can express their ideas clearly and charismatically, often making them very effective in fields like law, politics, or sales. The word "gab" is an informal term for conversation or chatter, so having the "gift" of it implies a superior command over language and social interaction. To rule out the other options: "just at the last moment" is described by the idiom at the eleventh hour; a "life full of quarrels" might be described as leading a cat-and-dog life; and something "impossible" could be referred to as a tall order or crying for the moon.