New York City taxi officials have put the kibosh on those naughty South Park kids advertising on city taxicabs.

As part of a pilot program with the Taxi and Limousine Commission (TLC), Comedy Central planned to emblazon several cabs with ad "wraps," featuring South Park characters Kyle, Stan and Cartman (Kenny's still dead) to help publicize the show's sixth season, which kicks off Nov. 6.

But after submitting an "artist's rendering" of how the cabs would look - including one design featuring Kyle passing wind -- Comedy Central could not get the green light.

"We have not authorized any wraps on the side of cabs . . . regardless of the content," said TLC commissioner Matthew Daus. "We want our yellow cabs to look yellow."

Insiders at Comedy Central say the TLC was initially "very interested" in the South Park campaign and even asked for revised artwork -- but then backed off citing "questionable" issues with the show's content and TV-MA (for mature audiences) rating.

"We were very excited to be the network that would launch this pilot program -- but we were upset and disheartened when we learned it was the content rather than the design that killed it," said Comedy Central spokeswoman Aileen Budow.

"South Park has become something of a pop culture icon -- this [campaign] was innovative and edgy and that's what we liked about it."

"It's not exactly a front-burner issue for us," Daus said. "It's not a top priority."

South Park ads will still be seen on the tops of taxicabs -- just not on the sides, Budow said.

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