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A high degree of flexitude. It can be forced or come naturally. Usually occurs during brunch.
Example 1

Person 1: Is she doing an fbf (fat brunch flex) today?
Person 2: I guess so. She's in that white sundress.
Example 2
Person 1: Ima fbf today. (Proceeds to wear balenciaga/off white/Gucci/tori/Ferrell)
by Wxn June 07, 2018
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