So, once I got home I looked it up. According to BibleGateway.com the KJV version reads:

Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.

So… lets see. It appears to mean that they will wonder the streets randomly knocking on doors. If someone answers they’ll just walk in and start consuming the occupants food. They will at least be gracious enough to allow the resident of the recently invaded house to eat some of their own food whilst they do this. That seems like a very odd and not particularly neighbourly or moral act. Gives me yet another reason not to want to answer the door when these freeloading degenerates come knocking.

Isn’t it handy when people like this warn you up front of their poor judgement. Albeit by hiding behind an weird verse written by bronze age desert dwelling goat herders, translated and re-translated over and over again over the centuries. Don’t let that last bit worry you though, the Bible is after all the unchanging and inerrant perfect word of God!