Fatly adv. : Grossly; greasily.

Example:


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Defination from the web:
fatly from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... 2 : in the manner of one that is fat <waddled fatly> 3 : in a smug manner : complacently <snickered fatly> Learn more about "fatly" with Google Search: ...