Top definition
The last day of the business/school week, otherwise know as Friday, is a day where all may indulge in "fatty" foods without remorse of keeping a diet. It may also be looked upon as a day to look forward to relax, and release one's stress by eating "fatty foods".
Sadie: OMG I'm so stressed. I wish I could eat a whole tub of Ice Cream

Priya: Wait what day is it?

Sadie: Friday?

All: OMG FRIDAY FAT DAY!

*Both go and indulge in cookies n' cream ice cream*
by swagman123 December 16, 2011
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