I'm trying very hard to get rid of mine. 
Seriously, there's the literal sense, in which case we have no idea what the biology of draconians is or if anyone's thought it out (maybe it contains its magic-generating organ), and the artistic sense, in which case it's probably drawing on existing tropes about the way a civilization of mammals, specifically great apes, view each other's bodies, and implying it doesn't get a lot of exercise. (There may also be a bit of the old 'ugly=evil' trope that goes back to fairytales, remaining unexamined because the thing depicted is nonhuman.)
Lizards, for instance, deposit fat in their tails, backs, and sides. This draconian has the standard fat deposition pattern for human males.
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