I guess it's because they did a thing like, idk, Cringe/any kind of sexual thing or shipping a ship they haven't shipped before with their fave characters or Oc's, etc., and then after they've done it they name it like the things you've mentioned....did that what I just wrote any sense?
You're on the right track. But there some people who makes casual pictures of an MMD model either from UT, BATIM, or FNAF. Their Descriptions tells me about the details of the models. But they had to name their submissions, "Forgive me that I have sinned". here are some examples: forgive me for i have sinned, help me for i have sinned XD, forgive me i have sinned. There's more but I forgot the links. I asked people why the named it that way and some people told me that they felt bad using that model. Some people told me that there were being random which I don't really buy that all that much. I used to not care when I saw a few people doing this, but now I've seen a lot of people doing this right now. it's literally starting to drive me a little crazy.