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
by Russ December 13, 2006
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Someone who messes up your chances with a girl by portraying you as untrustworthy, dishonest, a womanizer, or otherwise undesirable.
damn I was bout to hook up with that bitch over there till the god damn dirty mack fucked shit up
by webstedge March 16, 2009
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The act of setting up an angle on someone to make a move on that someone's boyfriend/girlfriend, fiancee or spouse.
Don't trust that fool. He'll dirty mack your ass the second your completely gone.
by Mr. Terrence L. Trezvant January 23, 2005
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some one who is being a hater!!
(throwing salt on game) trying to make you look bad
damn i wish these fools would stop dirty mackin me
by millionsin05 August 5, 2005
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A band who's members included Eric Clapton, John Lennon, Mitch Mitchell, Keith Richard, Yoko Ono, Jimi Hendrix(?)...and performed at the Rolling Stones Rock and Roll Circus in 1968.
Wow, Dirty Mack really shredded! They were an awesome combination of musicians. It might have been great if they had put together an album...though maybe without Yoko.
by Seamus Angus April 13, 2008
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One who has sexual relations with his/her best friends spouse
J. Whiteside and T. Kuyper fucked, what a dirty mack J. Whiteside is
by ilmoam September 7, 2005
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twist of the word mack daddy

macking on a girl(s) who is attrociously ugly.
jeff was the mack dirty at that party last week.
by felix h. May 3, 2007
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