Two girls one cup

This is a perfect description of viral video. What I'll do, after having the whole experience, is post the definition of the phenomena - that's an awful name for it - from urbandictionary.com; typically I wouldn't post something as blatantly obscene as the description, but I'll explain. Actually, I'll post what the ashvegas blog wrote about it, which is how I discovered it, and spare you the details of the urbandictionary description:

OK, if you haven't heard of this YouTube phenonmenon, then you're out of the loop. The video is known as "two girls, one cup," and it's totally disgusting. Perhaps the nastiest video ever posted on YouTube. Seriously. We're not sure we even want to describe said video.
But it's not even about that video any longer. It's about videos that show a reaction to the video. The "two girls, one cup" post has spawned a cottage industry of videos showing people reacting to watching the nasty video. Thus, the video above. Enjoy. And if you dare to watch the original, that's on you.

Note: this is not any sort of spam or joke. Note also: this is probably not worth your time. Last note: sorry.