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A person or being that largely spends his or her time bathing in their own filth whilst becoming ever larger in girth and width through consumption of many upon many cupcakes, ham sandwiches, and general assorted edible products.
"Thats one hefty oitball fat if ever I saw one."

"Is that an otiball fat on the horizon or is it a hot air balloon?"
by Tommo The First July 31, 2006
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