Cows by Matthew Stokoe (which for some reason I have been putting off for a while)
"I challenge thee to find a bloodier, greasier, shittier (absolute literal meaning intended) book than Cows. Peppered with gratuitous uses of the word “c-nt”, obscene amounts of violence, and unbearable nihilism, Cows is the most vile novel I have ever read. I regret being so curious as to make it through the entirety of this book (I stopped about 25% of the way through because I almost puked, but picked it back up again a few days later because I thought I needed to know how it ended). I wouldn’t trust the moral compass of whomever has finished book - yes, myself included - and would run far, far away from those who say they enjoyed it. Cows is a hedonistic vomitorium that takes bestiality, voyeurism, gore, and depravity to a whole new fucking level."