I didn't watch the 2girl1cup vid, but here's what i found off
'yahoo answers'. 
It starts off with two girls making out and it looks like an
average internet porn clip. But then begins the carnage when one
girl excretes into a cup and the two begin to eat from the cup.
They then make out some more with faeces in their mouth. After this
they start to vomit into each others mouth.
