Bobby Boucher, a socially awkward and sheltered 31-year-old man from the swamps of Louisiana, has lived a life dominated by his overprotective mother, who insists on keeping him away from what she considers the corrupting influences of the world, including school and friends. Bobby's only job and passion has been serving as the waterboy for the local college football team for the past 18 years. Despite his dedication, he faces constant ridicule from the team and staff, leading to his eventual dismissal due to the vindictive actions of the newly hired coach. Bobby's life takes a turn when he is unexpectedly offered a similar waterboy role at a struggling rival college – the Mud Dogs – by Coach Klein, a kind-hearted but downtrodden figure who has not had a winning season in years.

At his new team, Bobby continues to face mockery, but an unexpected moment of fury reveals his extraordinary tackling ability. Coach Klein, recognizing Bobby's potential to change the team's fortunes, convinces him to give playing a shot, despite his mother's vehement opposition and lies about the dangers and immorality of college and football. As Bobby begins to find his place on the team, his newfound confidence and unique tackling skills inspire the Mud Dogs and ignite their spirits. His performance transforms the team's dynamic, leading to a series of wins that invigorate the entire college. Meanwhile, Bobby embarks on a journey of self-discovery, challenging his mother's restrictions and exploring the world beyond his sheltered life, all while navigating the complexities of first love and newfound fame.