I've become convinced that, much like the anal cavities of otters/foxes/etc in much art found on this site, Goat likely has some kind of cosmic void of a stomach capable of devouring a near-infinite amount of whatever tastes good to him.

Being a mammal (of sorts) doubt I'll ever see him rapidly producing weaponized eggs after meals. He hasn't yet exhibited the ability to copy the powers of what he eats though that's likely because he hasn't started eating people. Yet.