Top Definition
-noun: An overweight person who disappears for an extended period, then reemerges only to show off their slender new figure.
Most fat-a-pillars will never admit what they do with all that excess skin.

The average fat-a-pillar regains most or all of the weight within a year of losing it.

Fat-a-pillars tend to be nicer than girls who were born skinny.
by f'd January 01, 2011
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