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
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Get the Jacking my slacks mug.After a long night of romance, Slacking is when you dump a hot load of cum inside her and leave out the widow, saying "you just got slacked"
by PheonixSlacks March 19, 2024
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Get the Slacked mug.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
by anonymous September 15, 2020
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