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1.
Any day where one is completely unbound by obligation or responsibility, be it present or future.
College students will often find the first day of a semester break to be the closest thing to an F-day, despite the impending semester.
by Mr. Internet May 18, 2006

Words related to F-day

day f day free obligation responsibility
 
2.
a statement of agreement; certification. Usually used in an exclamitory tense. i.e: indeed, fo' sho' , yessir etc.
Gustavo Dudamel conducts like boss f'days.

He be pimpin' those hoes f'days.

A: Are you a big breakfast fan?
B: Why yes I enjoy fried strips of pig ass cooked f'days. And you mon frere?
A: F'DAYS!
by RockyspamMontevideo93 January 26, 2012