When two or more individuals leave the comfort of their homes and brave the elements to go to a desired fast food establishment.

If only one person is involved with the operation, the term "Solo Fat Run" is used instead.
"Hey Mo, want to go on a fat run?" -Pin

"Sure, where do you want to go?" -Mo

"Wendy's to get a Baconator" -Pin
by JPin March 19, 2013
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The act in which a group of fat friends engage in a midnight drive to buy fast food in the hope to either increase their stretchmarks size or amount of stretchmarks, the food can be eaten at any time.
Fat Cunt 1: Do you want to go for a fat cunt run?
Fat Cunt 2: Sure.
by God of Fat May 15, 2016
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