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Hacky Sack Day 

The first sunday of the month shall be devoted to hacky sack.
April 3, 2005

It begins
Hacky Sack Day by Jeremy March 28, 2005

slack day 

Slack day comes every April 27th. It is a day in which managers get to sit on their asses all day with no repercussions from ownership. Manager typically gets his jollys as he watches his work get done by someone being paid half as much,also see philing it
Owner:What are you doing today?
Manager:Nothing it's slack day!
Owner:Well I'm gonna go crack the whip on those bitches.
slack day by Cream Waffer April 28, 2008

pack-in-the-sack-day

On February 31, people pack in the sack all day
I packed in the sack with my boyfriend, last pack in the sack day.

pack-in-the-sack-day

Every February 31, Kurtis's family and friends pack in the sack all day.
Paul and Andy are going to tag team Kurtis's mom on Pack-in-the-sack-day.

G-Slack Day 

When a event or large group gathering gets canceled due to the COVID-19 virus.
Hey are you going to Coachella this year?

Bro you didn’t hear? They pulled a G-Slack day.
G-Slack Day by G-Slack May 5, 2020
Sack day is the idea that your birth date should be the day that you as a sperm where created in the balls instead of the day that you are “Birthed”
“Its my sack day today
Sack Day by kexsium December 5, 2025