Top Definition
Term used to define eating a large quantity of food during one meal or at a fast food joint/restaurant/buffet. It may even be used for when you're at home! Originally excavated by the Straight Up Squad.
Kevin and Luis are Fatassing It Up at Jerry's by eating two large pizzas.
#fatass it up #fatassed it up #fatass #eating alot #obese
di Young Killa Koala 27 luglio 2011
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