A fat person, very round objects, or an object with lots of smaller round object.
Her ass is so roundular.

Look at that UFO its so roundular.
wow that ship is so roundular.
by Lucky Ice January 20, 2011
A spherical object that isn't a perfect sphere. Not completely smooth.
The Earth is roundular because it's spherical but not truly due to canyons, mountains, etc etc.
by Patziken August 18, 2013

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