Top Definition
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 Pinly March 18, 2013

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