The phrase refers to Barack Obama, the former president of the United States, and gains its comic effect from being stated as a completed fact rather than as news or commentary. Online, short spoken clips like this circulate as reaction sounds because they can be dropped into almost any edit where absence is the joke. Creators use it to mark departures, failed comebacks, and moments when a person or idea is suddenly no longer present. Its staying power comes from that flexibility: the line is short, instantly understood, and blunt enough to close a scene on its own.