a game of surprise involving knocking things out of another person's hands.
Dylan: *walks by with his books*
Trey: *knocks them out of his hands* "mac mac"
Dylan: "Shit" *picks up books again*
(repeat as many times as wanted)
Mariah: *eating a box of Cheez its*
Sara: *knocks them out of her hands* - "mac mac"
Mariah: "Damn it Sara"