Internet folklore is strange. In the early 2000s, shock sites and peer-to-peer file-sharing had mislabeled files like “Rocco_Siffredi_TOILET_ possessed_scene.avi” that were actually:

He tried to scream, but she pushed deeper.

What you’re looking for is Art of the Devil 2 (2005) – a rough, possessed-in-the-toilet horror movie. Rocco Siffredi has zero connection. The minus sign in your search is correct: exclude him, and you’ll find the real answer.