A Friday night dedicated to general foul, disgusting, unkempt and unruly behaviour.
M8 I'm so done with work.
Oath m8, let's have a Feral Friday with the rest of the staff.
FOATH I could use some feral unwinding.
Thank god for Feral Fridays.
Feral Friday is any friday where a person begins to act feral, usually regressing to an animalistic state such as that of a rat or a rabid dog. It is usually is used to refer to the first friday after a holiday
person 1 "dude, you're acting crazy"
person 2 *growling* "yes-yes it's crazy-Feral Friday!"