I'm sorry to poison your minds with reality, but, well, we live in it.
Don't watch while eating (especially meat) if you're naturally queasy.
I feel like some solicitor here, but uh, If you look closely at were they're dumping the pigs in you'll see something small and non-pig-like. I dunno, maybe a cat? Rat who had a large dose of hormones? Or maybe they're seriously dogs? Whoa, irony. Also notice they didn't gut the pigs to remove their bladders, intestines, and other organs you normally remove because they contain, to put it lightly, waste products. Yum.
So THAT'S what they mean by mechanically processed meat.
They also pour ammonia into the meat-shit mixture to kill all the bacteria from the crap. I admire their efforts to aid our current overpopulation problem. Lovely, ain't it?
I'm considering becoming vegetarian now.