Flip could be anything. Most ravers refer to "flipping" as mixing Ecastsy and some other drug. Unless your more specific there is no way we're going to beable to help you.
And it could be ANYTHING .. probably a combo like Deus said, but if it's not - well, no one here can tell you what the drug YOU are buying is (unless they are selling) ...
Deus, go ahead and execute this one..