On Saturday I'm meeting a person whom I met online to do some coke. He is a stranger, and I was wondering if cocaine can be cut with any kind of date rape stuff?
You can pretty much put anything crystalline or white in color that is able to be crushed into a powder. There are all sorts of things someone could cut cocaine with and yes that includes bad things.
This is wholly inappropriate for other drugs as it's entirely speculative and slightly creepy-rapist-vibe, but yes, cocaine can be cut with almost anything. Whether someone is sleazy enough to do that is another question.