Attempting to mack on another person's significant other by talking bad about them behind their back.
If you've ever had a girlfriend/boyfriend leave you and hook up with your best friend, you can be sure some dirty macking was going on while you were dating your ex.
John: "I'll be right back guys"
Dirty Mackin' Bob: "So Cindy, did you hear how John was talking to that slut Suzy when you were out of town? He doesn't appreciate you."
Cindy, John's Girlfriend : "Don't try dirty macking on me just cause my boyfriend's not here. Aren't you supposed to be John's best friend?"
John comes back and slams dirty mackin' Bob in the face with a shovel
John: "I'll be right back guys"
Dirty Mackin' Bob: "So Cindy, did you hear how John was talking to that slut Suzy when you were out of town? He doesn't appreciate you."
Cindy, John's Girlfriend : "Don't try dirty macking on me just cause my boyfriend's not here. Aren't you supposed to be John's best friend?"
John comes back and slams dirty mackin' Bob in the face with a shovel
by Russ December 16, 2006

by tearuptheload April 12, 2017

Someone who messes up your chances with a girl by portraying you as untrustworthy, dishonest, a womanizer, or otherwise undesirable.
by webstedge March 16, 2009

by Austin J. Petolillo January 1, 2012

Packer fan “ dude the bears suck dick
Bears fan “YA? Well do you have Khalil Mack?
Packers fan “....”
Bears fan “YAA bitch boy!
Bears fan “YA? Well do you have Khalil Mack?
Packers fan “....”
Bears fan “YAA bitch boy!
by Besrsfan52 January 20, 2019

That fellow in the long black coat and sunglasses looks mack as fuck.
These goods I have purchased are mack as fuck.
I ate one too many cakes and now I am feeling mack as fuck.
This situation is mack as fuck, mush.
These goods I have purchased are mack as fuck.
I ate one too many cakes and now I am feeling mack as fuck.
This situation is mack as fuck, mush.
by Dear Mr.Dead December 19, 2011

by Bungalow Bill November 27, 2001
