This is the prime example of dog connotations that Women give to guys that have done them dirty in other words played them.
Dirty Macks are the type of dude that will tell a Female they "love them" when they really don`t to try and get a piece of ass.
Dirty Macks in my opinion also fit the description of a "Dusty Nigga" with a "Thugh Mentality" let`s be honest in the hood a thugh is the lowest of the low lifes and his "game" is no different it`s always on some "Getting over on a female tip".
I`ve even come across dusty dirty macks that will purposely have kids by different hoodrats to live off the goverment and in some rare cases their kids.
Dirty Macks are also a dudes who still want to cheat low key- but find themselves in a relationship to a Female they have lied to be with her in the first place.
Dirty Macks are often referred to by Females as players because they often just want to fuck females by deceiving them and getting over on them somehow.
These are just a few ways to describe a "Dirty Mack" or course there is more but you get the idea.