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The episode with underpants gnomes from season 2, episode 17 titled "Gnomes".
South Park - 1997 Gnomes 2-17 was released on:
USA: 16 December 1998
Ginger Kids is episode 11 of South Park season 9.
this is the south park movie
The South Park episode referencing Dubstep was Season 15 Episode 7 "You're Getting Old."