There's a video making its way around the net called "Two Girls, One Cup." I think it's disgusting. I don't know for sure, because I had to shut it off after thirty seconds and I'm sure more stuff happened after that, but I refuse to find out what.
How disgusting is it? It's so disgusting that there are dozens of YouTube videos where people record themselves and others watching it for the first time and reacting.
Here are six. I could easily have put up a lot more.
If you want to see the original, you're going to have to be proactive and seek it out yourself. I'm not going to help you. Frankly, the imagination is a lot more fun.