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Slack tire 

This is a tire that is low on air pressure
His car has a slack tire
Slack tire by Agnes Ann May 7, 2018

Slack receipt 

The passive-aggressive act of notifying a team member on your public channel (instead of the private one) that you created a service ticket for them for something that is malfunctioning because clearly he didn’t test that code and you want to call him out.
Hey, did you see that slack receipt in our public channel from our bro on the Jenkins team? You broke his provisioning pipeline.
Slack receipt by Cialexander April 12, 2020

Slack and cack 

When you are giving that sloppy toppy and you nut in her mouth and leave.
Hey Martha! What did you and Tom do lay night?
You know the usual slack and cack

slack karen 

Slack Karen’s are the busybodies at your office who treat it as their own social media fiefdom. They monitor all channels, insert themselves into any discussion, and argue with you if you post something they disagree with. Most of their work day is spent in arguments and self-started drama

They are usually very liberal but conservative versions exist too. If you call them out on their odious behavior, they’ll DARVO and pretend to leave forever, only for the cycle to restart the next day.
Person 1: Wow, Cynthia is really upset about the recent election results
Person 2: They are upset about everything; they are a Slack Karen. Do not engage with them.
slack karen by Lolwut7 February 23, 2022

Slack attack 

Similar to a heart attack but the victim suffers numbness of the legs and a slowed heart rate and the craving for anything crunchy.
Guys hold on, I think I'm having a slack attack!
Slack attack by Everybodyonce December 10, 2008

slack-jawed idiot 

A lazy, shady character that's unconsciously incompetent.

He think's he's "the man", but everyone else sees him as being a fool.
Just look at mike! That slack-jawed idiot doesn't even have a clue!
slack-jawed idiot by Robertrvw March 20, 2016