New parents Mac and Kelly are living the American Dream, complete with a baby girl and a new home in the suburbs. Still, they want to believe that they are still cool, so when they discover that their new next-door neighbors are dozens of fraternity brothers-led by charismatic Teddy-they try to play along. But when the parties grow increasingly more epic, both sides begin to fend for their turf. The sabotage escalates into extreme one-upmanship, beginning an epic Greek war for the ages.