Each member of the gang gets one day to do whatever they want while the rest of the gang must participate. This is Mac's day.
Each member of the gang gets a day to do what they want while the others must participate. Mac's Day involves him and his cousin, known as "Country Mac", doing things that are bad ass. But while the gang grows tired of Mac's antics, they soon begin to scheme to replace Mac with Country Mac.—halo1k