What people who aren't from Ontario call it. Mostly caused by extreme jealousy from other provinces who wish they were Ontario.
Ontario has tons of great lakes, cottage country, beer and hot women. The rest has shitty praries, freezing cold winters, and economies based on fossil fuels that will run out in about 5-10 years and put them back in the toilet where they used to be.
"Hey Steve, you going home for Christmas?" "Yeah, I'm flying back to Onterrible"