American Animation TV series fat girl stuck in sewer

It is an American Animation TV series that i remember some details of an episode, this girl gets stuck in the sewers but her friends can’t set her free and decide to let her there through the night, so she could lose some of her fat and get out of sewers, but some foods have been dropped in the sewers and She eats it.

Sounds like The Oblongs, episode Flush, Flush, Sweet Helga:

Here’s a clip:

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