バイバイbaibai
1.

A casual expression used to bid farewell, typically among children or close friends, conveying a friendly parting sentiment.

2.

A phrase that signifies the act of saying goodbye, often used in informal contexts to indicate the conclusion of a meeting or interaction.

3.

An informal farewell used predominantly in friendly or affectionate exchanges, often associated with childhood speech and familiar relationships.

4.

A lighthearted way to express a temporary departure or separation, commonly understood and used in everyday conversations.