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1. A hamburger consisting of three (or four, sometimes five) beef patties, each topped with a cheese of your choice. The meat is slapped on a huge bun, and can be topped with other things (onions, mustard, ketchup, pickles, etc.) May also be called phatburger in some areas. Not usually found in chain restaurants, but a staple of greasy spoons on the corner. The burger called a fatburger because of its size, and because eating a lot of them will probably make you fat. 2. Depending on where you get it from, it can be the best burger you'll ever have....when it's cooked properly.
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