It’s a cloudy sky photoshopped (crudely) to obliquely resemble that iconic image, with the sun shining out of where the sun ordinarily does not shine.
Vague enough that could see how some innocent might not register it as a rude image at all. But still, out of context, what makes the image humorous? I don’t get it.
It looks like one of those “Weathershot Of The Day” provided by a viewer. I’m with you though… how do you miss that? I’ve never seen goatse but now I’m afraid I’ve got a pretty good idea of what’s been freaking people out.
If it was anyone but you lieu I might take that sentence seriously. Just google it and get it over with. It’s yucky but it’s not THAAAAT horrible. What you’re imagining is probably worse than the reality. There isn’t even any poop in the picture.
Eurrgghh. Even reading the Wikipedia article started to make me feel ill. And the description of “tubgirl” was worse than the one I thought they were referring to, on Rotten.com.