Mac "ratted" on drug dealers so he could become the main drug dealer of the school.He prefers to be simply called "Mac." Mac comes from a broken home; his father has been incarcerated for dealing meth and his mother is extremely apathetic and unemotional.For the first six seasons Mac's full name was kept anonymous as a running joke, though in the season four episode "Mac & Charlie Die," Mac's father's name is listed as "Luther Mac" on his parole papers and his mother is referred to as Mrs. Mac's full real name, Ronald Mc Donald, wasn't revealed until the season seven episode "The High School Reunion".Mac hates the name due to its connection with the spokesman of the popular fast food chain Mc Donald's as well as his old nickname, "Ronnie the Rat," which he obtained from ratting on fellow drug dealers in high school.
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Mac sincerely believes that he is an adept martial artist with "cat-like reflexes" and usually wears sleeveless shirts to draw attention to his physique and exhibit his tribal tattoos.
Despite his apparent fitness, Mac generally focuses his workout time on developing his, as Dennis called them, "glamor muscles" and is largely the weakest member in The Gang, behind everyone but Dennis.
Mac and his mother also own a dog named Poppins, who despite being extremely old and prone to eating poisonous objects appears to be practically indestructible.
He sees himself as a karate expert and total "badass".