Obviously my post didn't get upvotes and laughing gif replies because no one got the pun, so allow me to explain.
It's a reference to the fact that Smaug names is close to smug, which means to feel content about oneself. In the image showed in HESKEYTIME's post, see, the dragon named Smaug is depicted with a large grin on his face, surrounded by his so coveted treasure, haha, so one could say Smaug is being smug about his actual "predicament", get it?