Fired from his band and hard up for cash, guitarist and vocalist Dewey Finn finagles his way into a job as a fifth-grade substitute teacher at a private school, where he secretly begins teaching his students the finer points of rock 'n' roll. The school's hard-nosed principal is rightly suspicious of Finn's activities. But Finn's roommate remains in the dark about what he's doing.
A smooth-talking ad executive attributes his remarkable success with women to his ability to manipulate their emotions from the moment he first meets them. When his teenage nephew drops in for a visit, he soon learns that his approach isn't as foolproof as he thought when he attempts to teach the boy how to pick up women.