The film ‘Back to the Future’ provides the OED's earliest recorded example of a colloquial sense of 'hello', used to imply (sometimes disbelievingly or sarcastically) that the person addressed is not paying attention, has not understood something, or has said something nonsensical or foolish.

[1985 B. Gale & R. Zemeckis Back to the Future (film): “Hello, hello? Anybody home? Hey! Think, McFly. Think.”]

Image credit: Gif via motionlmags

The film ‘Back to the Future’ provides the OED's earliest recorded example of a colloquial sense of 'hello', used to imply (sometimes disbelievingly or sarcastically) that the person addressed is not paying attention, has not understood something, or has said something nonsensical or foolish.

[1985 B. Gale & R. Zemeckis Back to the Future (film): “Hello, hello? Anybody home? Hey! Think, McFly. Think.”]

Image credit: Gif via motionlmags