The plot deals with the four South Park eight-year-old stars who sneak into a profanity-filled movie featuring fictional Canadians Terrance and Phillip. After watching the film the boys start to swear even more than usual, and the parent and teacher outrage that ensues triggers an international crisis that eventually escalates into a war between the United States and Canada. A sub-plot involves a scheming Saddam Hussein, who tries to take over the world with the assistance of his gay lover, Satan.
The film is a musical, and features six songs. The song "Blame Canada" was nominated for an Academy Award.
South Park: Bigger, Longer & Uncut is allegedly the most profanity-filled movie ever produced. It is difficult to dismiss this claim, considering the film features a song entitled Uncle Fucka that uses the word "fuck" over 30 times. The song title originally used "Mother" rather than "Uncle", but it was changed to qualify for an R rating (instead of NC-17); also, the authors say "Uncle" sounds funnier than "Mother".
The movie angered moral conservatives not only for its heavy use of profanity, but also for its depiction of conservatives starting a war against Canada purely because of Terrance and Phillip's use of profanity. The underlying theme of the message of the film, however, is that it is the responsibility of parents and guardians to protect their children from what they deem inappropriate, and that censorship of anything (particularly film and television) is simply a parental tool for escaping blame. (This is summed up neatly in the line from "Blame Canada" when a group of parents sing: "We must blame them/the cause of the fuss/before somebody thinks of blaming us")