Mc Nasty.

Mechanically Separated Chicken, from Fooducate, via Early Onset of Night
From Huff Post:
The photo above is being extensively passed around online today, and for good reason: it's a peak into the rarely-seen world of mechanically separated meat, or Advanced Meat Recovery (AMR).

Fooducate writes:

Someone figured out in the 1960s that meat processors can eek out a few more percent of profit from chickens, turkeys, pigs, and cows by scraping the bones 100% clean of meat. This is done by machines, not humans, by passing bones leftover after the initial cutting through a high pressure sieve. The paste you see in the picture above is the result.

Michael Kindt continues:

There's more: because it's crawling with bacteria, it will be washed with ammonia, soaked in it, actually. Then, because it tastes gross, it will be reflavored artificially. Then, because it is weirdly pink, it will be dyed with artificial color.
But, hey, at least it tastes good, right?
High five, America!

The resulting paste goes on to become the main ingredient in many of America's favorite mass-produced and processed meat-like foods and snacks: bologna, hot dogs, salami, pepperoni, Slim Jim-like jerkys, and of course the ever-polarizing Chicken McNugget, where the paste from the photo above was likely destined.