I think this is so annoying. When I attempted to upload that image first time, server responded this:
...and failed uploading. Although I attempted uploading that two times more at the same time, but they didn't work.
Meanwhile, after 20 seconds from when I failed uploading that first time, DepressedPotato just uploaded that successfully at the first attempt, unlike me. So I failed uploading that image eventually.
in human speak means "a post with this MD5 already exists." In other words, he beat you to it, snipe harder. Or don't and the world will be a happier place.