I was born and have lived in England for decades and I've never heard it or read it before ever. I would love to know where the parent is from that they conside

I was born and have lived in England for decades and I've never heard it or read it before ever. I would love to know where the parent is from that they consider it to be "one of the most widely used idioms in the English speaking sphere". How many times per day do they use it? What kind of hell do they live in that they would need to use that phrase so often?!