when you're trying to tell someone something and they just don't actually listen, they're just waiting for their turn to talk
You start telling your mate about the worst day of your work, really building to something, and halfway through he nods once—*once*—then immediately launches into a twenty-minute story about his Deliveroo order being late. By the end you've forgotten what you were upset about, and somehow you're the one apologizing that his garlic bread came cold.