This is the second part of the D.E.N.N.I.S. Method used to seduce woman. After someone uses the D.E.N.N.I.S. method someone else can

M. move in
A. After
C. completion
and easily steal the girl. This was made popular in the show "Its Always Sunny in Philadelphia"
Dude i gutta M.A.C. that chick to get the scraps
by Dsquared7 December 24, 2009
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A brand of designer make up short for Make-Up Art Cosmetics
She only wears M.A.C. make-up.
by Lizzy Bean March 28, 2007
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M.A.C. Is the acronym for Massive Alden Cock. This is a band that Likes to rock out with there cocks out.
Hope you love this band there quite huge!!
An example of the band M.A.C. is Alden's Cock Playing guitar while he plays drums!
by ClaryMeredith October 16, 2010
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The M.A.C. System refers to a remarkably simple system that every male puts into effect at one time or another. The M.A.C. stands for:

M-Move in

In short, once one of your friends is done or broken up with a girl, you silently move in to support the girl in her time of dire need. Crushed and heartbroken, the girl will talk incessantly, but will eventually open up sexually. It can be noted that this system requires almost minimal effort and simply nodding and listening works, combined with a few hugs.

The M.A.C. System was made popular by Mac, a fictional character from It's Always Sunny in Philadelphia. His system is highly underrated and deserves as much attention as the D.E.N.N.I.S. System.
Example #1

Dennis: "What is this swooping in business?"

Mac: "Oh that's my system,The MAC: Move in After Completion. I wait til you're done with them and then I swoop in, give them a shoulder to cry on, then we hump."

Dennis: "You've been humping these girls after I'm done with them?"

Mac: "Oh yeah dude! I'm swimming in your wake."

Example #2

Robert: "Hey, Charlie, you get laid this weekend?"

Charlie: "Yeah, Mike broke up with Holly on Thursday so I used The M.A.C. System on her and we made sweet, passionate love."

Robert: "No kidding? Bump it."
by Brocker V December 7, 2009
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An area in the city of Vallejo, where only the true mac's are found hustling. It is located on the corner of Miller Ave (around the corner from Teeters and Smorga Bobs)
Its a mac thang...Biatch! M.A.C Block...Ya Know!!
by MaCk So December 24, 2003
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n. an asian slut with way too much makeup on (like those who work at M.A.C. Cosmetics) to the point where you cannot see the relevance between them and their respective family members.

examples of how to identify a M.A.C. bitch:
1. see if you can see the individual hairs of her eyebrows
2. see if you can tell what her natural skin color is
3. see if her makeup always matches her outfit, down to her wetseal thong
M.A.C. bitches who go to the predominantly asian clubs every weekend, who usually have 'ties' with the bouncers.
by happyfunker March 16, 2009
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M.A.C. is a heavily overweight negro with an attitude as bad as his hunger.

Has a SIX POINTED PENIS often referred to as his "Star of David."
Surprisingly this will not save the Jews from Hitler.

Wakes up at 2 p.m. and spends 25 hrs a day watching YouTube videos.
"Bro you're such a M.A.C. aka Man Across Corridor I wish we had you in the 1940's"
by Kevin Dibble's Mom April 11, 2009
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