So, in my experience (which, actually, is fairly sadly limited to crappy chick-lit and listening to friends), if someone asks you if you’d want to get a cup of coffee or something, there are two possible meanings. Meaning A is that they’re a buddy, you want to hang out and chat a bit and both like coffee. Meaning B is a bit more than that, with “getting coffee” being more a way to ask a harder question: Would you like to go on a somewhat-casual first date with me?
Of course, my experience could be entirely wrong, thus, this thread. In your opinion, is my assessment correct? Also, is this a particular American cultural thing? If, say, I were to go to England, meet a cute guy, and ask him this, would the meaning be conveyed? Randomly curious minds want to know these things.