That works out to 4.8x1012kg, which, compacted, would make a ball about 2km in diameter3.
Here it is compared to some other objects:
|Great Pyramid of Cheops||0.14x0.23km||5.4x109kg|
|Three Gorges Dam||0.18x2km||3.4x1010kg|
|just the meat4||0.76km||2.7x1011kg|
|asteroid: 1999 KW4||1.5km||2.4x1012kg|
|asteroid: 1620 Geographos||2.0km||4x1012kg|
|how much we eat in a year||2.0km||4.8x1012kg|
|asteroid: 2002 CE26||3.5km||2x1013kg|
To further help comprehend the dimensions, here is a list of the world's tallest buildings.
1 - world population
2 - average food consumption (I used the average of the two numbers)
3 - mean density of compacted food waste is about 1029 kg/m3.
4 - The size of the meatball we consume each year, as a species. See source.