The children of South Park are invited to Arkansas for the "Four Million Child Blow 2000," the first worldwide recorder concert.
In Mr Garrison's class, the class practice for the World's biggest recorder concert but sound appalling. Mr. Mackey then enters and explains the location will not be in Oklahoma, but in Arkansas. Garrison explains he can't go, he tells Mackey that's where his parents live. Mackey asks if Garrison received sexual abuse as a child, to which Garrison breaks into tears and runs out the classroom. Stan, Kyle, Cartman, Kenny and everyone else take no notice.
On the bus ride there, Garrison freaks as they enter Arkansas, Mackey tries to consult him, but Mr. Hat explains Garrison can't speak, Mackey explains Garrison is using Mr. Hat to cover up and that he has switched personalities. Mr. Hat then replies "You figured that all out by yourself Sherlock? Monkeys make better counselors!" Upon hearing this, Mackey is infuriated and gets into a fight with Mr. Hat in the passageway of the bus, to the anger of Ms. Crabtree. Mr. Hat wins, with Mr. Mackey having received minor injuries.
As they get off the bus, third graders from New York insult them and call them rednecks and queefs. The boys don't know what the latter means which causes the New Yorkers to laugh at them again. The boys vow to get revenge on them. The concert organizers, Yoko Ono and Kenny G address everyone.
Garrison visits his parents' house and ends up reducing his mother to tears revealing that his father never sexually abused him. His father is confused why people would be sad about this.
In their room, Stan and Kyle listen to Cartman testing to see if he can find the legendary "brown noise" while looking up queef in a dictionary. Stan and Kyle ask what it is and Cartman replies by saying that it was tested for during World War II and could make anybody who hears it crap their pants. Cartman is using Kenny as his test subject, Kyle doesn't believe Cartman. Stan and Kyle later come to a conclusion that queef is a made up word, and they decide to do the same to the New Yorkers, so when they ask the New Yorkers if they know what it means, and the New Yorkers reply "yes" then they can reveal that they don't because they made up the word. After some discussion they use Cartman's idea: mung.
Next day, the boys are shocked to discover that mung is a real word from the New Yorkers and are mad at Cartman.
Meanwhile, Mr. Mackey talks to Mr. Garrison Senior about his son's condition. When Garrison Senior reveals why his son is upset, Mackey is also shocked. He then says that there comes a time in every father's life when they must know how far they will go for their child.
That night, Cartman finds the "brown noise" and tests it on Kenny, who loses bowel control and craps in his pants. Stan and Kyle figure that if they put this in the New York kids' music then all the New Yorkers will crap their pants. As they change the music, one of the organizers believe Yoko Ono has changed the music again and gets this "new revision" distributed to everyone.
At the Garrisons', Mr. Garrison goes to bed depressed, later, somebody enters and has sex with him.
The next morning, Garrison leaves happily thanking his parents, preparing for the concert. His mother is pleased with his father who reveals he hired Kenny G.
At the concert, the boys look in horror as they discover the "brown noise" is in everyone's music, and despite their efforts they fail to stop the concert, everyone plays the note.
Later, it is revealed that everyone on Earth suffered the effects of the concert, and some even died.
The New Yorkers admit they think the boys are pretty cool for what they did, they then bid farewell, still wondering aloud what queef means, Mr. Mackey says it as he walks past. Garrison gives Mrs. Crabtree the directions of the journey home.