I know little about that series, so I naturally had trouble understanding this. The best thing was how the two butts looked just like each other! The drawings were really lush in this, as nice as anything you have worked on. I notice how the sponge seems to just make a puddle around itself. I am glad that this was not as disgusting as I thought it would be, judging from the title. You have at the description first to try to understand this.
I guess the classic idea of buttcheeks being funny will never die out. There was lush detail put into every aspect of this extremely goofy picture. The butt almost looks like a head with the paper crown on top. I wouldn't want to be up a butt mountain anyway. You might have more going on in your next picture but this delivers its message well.