The word "乌鸦嘴" is formed by combining the characters for "crow" (乌鸦) and "mouth" (嘴), resulting in the literal meaning "crow's mouth". This term originates from the cultural belief that crows are harbingers of bad luck, with their calls thought to foretell misfortune. Consequently, "乌鸦嘴" is used figuratively to describe a person whose utterances often lead to negative outcomes.