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.
by Cream Waffer April 28, 2008
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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.
by G-Slack May 6, 2020
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An event made by a kid who most likely did drugs in high school and tried to become a rapper and make his own holiday
Bro did you hear about G-Slack Day?

Who in the fuck is a G-Slack?
by September 16, 2020
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