[realdealblues]

I'm surprised to see so many votes for Irreversible. Much like "I Spit On Your Grave" or "Baise-Moi", harsh rape scene but I didn't find it all that "Nasty". The fire extinguisher scene was neat but I didn't find it nasty.

There's dozens I can think of that I personally find nasty for one reason or another. Just depends on what you find "Nasty". It's like what is "Scary" to you. Some people are scared of Zombies, others laugh at them. There isn't really one criteria that fits the bill.

That said, I would vote:

Salo: The 120 Days Of Sodom (1975)
(I was the only person in town who owned a copy many, many years ago and half a dozen film students in town found out and asked me to do a screening for them. The last half hour or so had most of them turning their heads or gagging, 1 girl left halfway through.

If Hostel is nasty to you try "Boy Meets Girl (1994)". It's hard to find but I personally found it worse than Hostel.

I also found The Doom Generation (1995) nasty, but that was just for the guy licking his own spluge off his hand, which I personally find "nasty".