Some info and a short description of this South Park episode on South Park Zone:
South Park - Goobacks is the 6th episode of the 8th season of the animated television series South Park, and the 118th overall episode of the series. It was originally aired on Comedy Central in the United States on April 28, 2004.
In this South Park episode, very poor people from the future travel back in time to find work, a fact that affects the town's economy and the employment of the original occupants. The townsfolk become angry because these immigrants coming from the year 3045 take their jobs for lower wages.
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(The complete plot for this South Park Episode)
This South Park episode starts early in the morning when a mysterious man appears in South Park, using some kind of portal (like in the movie Terminator). Unfamiliar with his surroundings, he is hit lightly by a car. Our boys, Cartman, Kyle, Stan and Kenny, after a sesion of shovelling snow, watch a report on CNN about the mysterious arrival. The alien, who has come from over a thousand years in the future, is looking for work because of the overpopulation and poverty of his time, and he learns that the money that he earns in the 21st century will be enough to feed his family in 3045. Soon enough, large numbers of immigrants begin to come through the portal.The aliens are described by CNN as "a hairless, uniform mix of all races" with the same skin color, while their language is a guttural mixture of all world languages. As the boys return to offer to shovel snow again the next day, they find that the newly arrived time-immigrants have shoveled all driveways on the street for very low pay. As the immigrants are willing to accept jobs for that kind of pay, the original workers throughout South Park are fired, thus resulting in massive unemployment throughout the town.
At a meeting to discuss their concern with the immigrants, construction worker Darryl Weathers complains that they have worked hard to get their pay high enough to make a living, but now are being ousted by the time immigrants. The other workers voice their own complaints, with each sentence finishing off with an increasingly slurred and garbled exclamation of "They took our jobs!", (also messing with the pronuntion)"Dey turk err jurbs," "Durker durr," and so on, which later on becomes some kind of slogan.
Later at that meeting, Weathers has the audience suggest ideas for stopping the immigrants from arriving at the town. One man suggests everyone stripping and engaging in an or9y; Weathers likes the idea, as it is the only way to stop the immigrants from coming because G. couples cannot spawn offspring. The protesters agree and begin the or9y.
Meanwhile, Stan's father Randy loses his job to an immigrant and becomes the spokesperson of the protesters. Randy is interviewed by CNN. Next to him is a very embarrassed and disturbed Stan, who explains that he understands that the immigrants are living in poverty and they are just trying to get by, but realizes that poor societies often hurt other societies instead of helping them. He suggests that the people of the present should try to make the future better so the immigrants will not need to come. The entire town begins to recycle, install solar and wind power devices, plant trees, give to the poor, etc., hoping to cause the Goobacks to disappear. Although the townspeople's efforts are successful, the boys observe that the work is not that cool.Stan apologizes and says, "Everyone back in the pile." The men rush back to the pile with the last straggler yelling the now completely unintelligible "Derka der!".