Learn English – What does this quote mean: “Why is this thus? And what is the reason for this thusness

Unlike the earlier reply, I would interpret that sentence with the quotes around "cure". I think they were probably added as an afterthought, after cure had been uttered, to indicate that it was not really a cure that was being described.

It is unclear what is intended when the quote...unquote are adjacent, but it is often used that way. I would try to avoid the ambiguity, and, as you suggest, speak the punctuation in the correct places.

This construction would not be used in writing, unless reporting verbatim on a speech. It can also be "signed" with the fingers when talking face-to-face.

There are two possible meanings for the phrase. The basic concept is that you've been wronged but you're supposed to be thankful for the chance to be wronged by the person.

The more likely candidate is that you are on the giving end of male oral sex but supposed to be thankful for it. See for instance here: http://www.screenit.com/movies/2010/the_social_network.html

The less likely candidate is that they punch you in the lip, so your lip is bleeding, but you are supposed to thank them for that. I can't find any support for this interpretation.