"What's up, bitches"
- Mac (It's Always Sunny in Philadelphia)Ronald "Mac" McDonald is a fictional character on the FX series It's Always Sunny in Philadelphia. Mac is Charlie's childhood friend and Dennis's high school friend and later roommate. He is a member of "The Gang", which also includes Dee and Frank.
Mac gets upset at injustices, but will pounce on any opportunity he sees as a fair chance to bang or make money. He was proud of his body and weight gain during Season 7, and is secretly ashamed of returning to his regular size.
Mac is portrayed by Rob McElhenney.