For the episode of the same name, go here.
Wacky Delly is an in-universe cartoon series created by Rachel Bighead (known at the time as Ralph) and conceptualized by Rocko, Heffer and Filburt. It was produced at Bighead Studios in Hollo-Wood. Rocko and his friends worked on almost all of its episodes.

How development went.
Plot[]
The plot revolves around three delly foods and their wacky adventures - Betty Bologna (voiced by Rocko), Sal Ami (voiced by Heffer) and Mr. Cheese (voiced by Filburt, and originally called Lester Roquefort).
Development[]
Wacky Delly went under development after Bighead's other show the Fatheads ended after 893 episodes and the executives reminded her that she is required to create one more new show under the contract before he leaves. Rachel gave Rocko, Filburt and Heffer free rein in creating a new television show, hoping that their ineptitude will get her out of the contract for good, after hearing Filburt declaring that Heffer's idea of a cartoon salami would get his contract cancelled.
Wacky Delly's production was troublesome, as Heffer and Filburt argued over the storylines of the show in a capricious manner, which completely annoyed Rocko to no end. At one point, Heffer considered removing the Cheese from the show, seeing as he wasn't really needed, much to Filburt's dismay. But, eventually, Rocko, Heffer and Filburt finished the production of the pilot episode for Wacky Delly.
Once the pilot was finished, Rachel then showed it to the executives, which turns out to be a huge, clunky, nonsensical mess. Despite how terribly-made the film is, the executives loved it, much to Rachel's shock.
Disappointed by the show's sudden popularity due to it squelching her prospect of being free to create her masterpiece, and trying to get out of her contract, Rachel frequently tried to sabotage the show, such attempts as having an episode being a continuous image of a jar of mayonnaise and over exposing an episode's film reel, but these attempts only ended up increasing the show's popularity, to the point of getting news reports on the outrageous new episode plots. Even when Rachel got help from her father Ed and attempted to use the heat ray to destroy Bighead Studios by melting all of Antarctica and causing a giant flood, it didn't work as Heffer used a crank to hoist Bighead Studios (which he thought was hoisting his car) over the impending flood caused by Ed's heat ray, much to Rachel's utter annoyance.
After yelling at Rocko, Heffer and Filburt, telling them how she hates the show and was trying to get out of the animation business to make "real art", Rocko told Ralph that she should be happy, as she is a much beloved animator and instead of hating Wacky Delly she should be embracing it, as her cartoons are her art. Rachel saw what Rocko said and decided to throw her full weight and support behind the show, creating what she saw as an artistic masterpiece using the meat characters... only to have it promptly cancelled just a few seconds into the next episode.
Legacy[]
In-universe, Wacky Delly went on to have a cult following, even if not as influential as it's predecessor The Fatheads, with many fans fondly remembered the first season of Wacky Delly over 10 years after its cancellation - at least before "that new guy" ruined it.