To give a sloppy blowjob to a half-erect penis. When a guy can't get hard but the girl sucks on his loose rope anyways in a messy fashion.
by batistaxxx2 October 23, 2020

by ItsVinnyBrahh April 8, 2019

Spending all your time on facebook when you should be doing something else of much greater importance.
Jennie- Man, I have two hours to write this 1,000 word essay for my psychology class. I could have done it last night, but I was totally face slacking.
Adri-...shitty
Adri-...shitty
by Pinkspi January 18, 2009

When you got fucked by some dude without a condom, then he dropped an anvil on your head and flew away with their elytra.
by pooslayer89 July 7, 2024

by Harry James-Parker September 24, 2014

To give a sloppy blowjob to a non-erect penis. When a guy can't get it up, but the girl sucks on his loose rope anyways in a messy fashion.
"Darnelle couldn't get it up last night bc he was too drunk, but I slacked him up anyways"
"Wow, what a good person you are!"
"Wow, what a good person you are!"
by batistaxxx2 October 23, 2020

Famous DEI practitioner and COVID diversity hire, slack was so useless that he turned to human trafficking his “affinity group” in his office and got fired for being the most useless mf to ever exist.
by Galvatron 1999 December 7, 2023
