Because they artists are white. And the art is made out of the trash from what they consumed over a month or so. I can’t remember the exact themes but it has an obvious innate feeling when you know it is from what they consumed that it is sort of tying today the junk we consume and the junk we produce from consuming and how that is part of our culture. A trashy part of our culture. The title is likely a bit tongue in cheek. Like you are what you eat, and he we are depicted by our trash.

You can look up if you want the answer in the artists words. *6 months trash. If it helps there are also trash shadow statues like this in the set of them pissing on the ground. Which is a trashy behaviour.