In 1954, each boy in a group of Florida high school students plans to lose his virginity. They go to Porky’s, a nightclub in the Everglades, believing that they can hire a prostitute to satisfy their sexual desires. The bordello’s proprietor, Porky, takes their money but humiliates the boys by dumping them into the swamp. When the group demands their money back, the sheriff, Porky’s brother, drives them away, but not before he extorts them for the rest of their money, further embarrassing them.
After Mickey (who returned to Porky’s for revenge) is beaten so badly he has to be hospitalized, the gang becomes hellbent on exacting revenge on Porky and his brother, eventually sinking Porky’s establishment in the swamp. Porky and his men, joined by the sheriff, chase the group, but the boys make it across the county line (out of Porky’s brother’s jurisdiction), where local police officers and the high school band meet them. One of the officers, Mickey’s older brother Ted, repeatedly damages Porky’s car, promising to drop all charges against Porky for driving an unsafe vehicle if the night’s events are forgiven. Because the boys are too young to have been allowed into Porky’s legally, Porky and his brother agree.
In a subplot, the boys peep on co-ed students in girl’s locker room shower, and Tommy, Billy, and Pee Wee see several girls showering. Pee Wee gives them away when he shouts at a heavier girl (who has been blocking his view) to move so he can see. While a few girls run out, most stay, finding the situation funny. To test their attitude, Tommy sticks his tongue out through his peephole, but gets it smeared with soap. Infuriated, he drops his pants and sticks his penis through the opening just before female coach Beulah Balbricker (who has a running feud with Tommy) walks into the shower area. Spotting the protruding member, she sneaks up on Tommy, grabs his penis and pulls with all her might. Tommy pulls free and escapes, but Beulah is determined to prove that the offending member (which has a mole on it) belongs to Tommy, going so far as to request that Principal Carter hold a police-type line-up of the boys in the nude so she can identify it. However, Carter balks at her request. As the other basketball coaches laugh, Coach Brackett suggests asking the police to send a sketch artist and hang wanted posters around the school. When this suggestion gets even Carter laughing, Balbricker leaves in a huff. She sneaks out of the bushes to ambush Tommy and actually drags his pants down, but she is pulled off him by police and dragged away screaming that she saw “it” and that she can identify its owner. Tommy breaks the fourth wall, saying, “Jeez!” to the camera.