A Kitten Named Bow, which was very obviously dubbed for English-speaking audiences due to completely non-existent lip sync. Characters tend to point out the obvious, especially in the first cartoon; they go out of their way to explain what is happening on-screen, even when they're not supposed to speak. The dialogue only consists of slow line delivery and "Bowwow!" But the horrible dubbing somehow makes it entertaining, albeit for all the wrong reasons.
It's also the reason the Beatles' manager Brian Epstein ordered the cartoons never be shown in England, even though Apple—the group's corporate entity—now owns them.
In fact, George Harrison used the phrase "so bad it's good" almost verbatim when discussing the show in an interview.
Harrison: I always kind of liked them. They were so bad or silly they were good, if you know what I mean. And I think the passage of time might make them more fun now.
Beverly Hills Teens: It's the embodiment of every cheesy thing about the 80's, every episode is packed with clichés, and most characters tend to be one-dimensional (but kind of likable). Still it manages to somehow be very charming, and is quite funny when watched with the right mindset.
Clang Invasion. The animation is rather limited, its humor is just unnecessarily random, and episodes often fall into a lot of cliches. At least it did not discourage some people to form a following of the series, especially with its likable characters.
Dennis the Menace has an in-universe example. In "The Price of Stardom", Dennis becomes the prop man for a Heidi-esque play starring Margaret and Mr. Wilson. During the performance, Dennis turns on a giant fan, has Mr. Wilson dress in a swimsuit for a costume change, drops a bag of fake snow on Margaret and opens a trap door that Mr. Wilson happens to be standing on at the time. The audience laughs throughout the entire performance and cheers when the play ends.
Most aspects of the French animated series based on Donkey Kong Country actually aren't all that bad. The characters are accurate to their game counterparts and have likeable personalities, some of the jokes written for the show are genuinely funny, and though the mere presence of singing in the show can be unsettling to new viewers, the songs themselves aren't bad. However, it still tends to be mentioned in these sorts of situations because the animation, perhaps the first thing people notice about cartoons, really is So Bad It's Good, and in some people's opinions has thus become by far the biggest reason to watch the show. The badly-deformed character models fall into the Uncanny Valley with such force, they bounce back out of its depths and end up looking hilarious, rather than scary.
G.I. Joe Extreme. Between the laughable live-action sequences, the hammy acting, and the pitiful animation, it has something for everyone to laugh at.
The entire premise of the animated series The Mighty Ducks. The series was about a group of hockey-playing, crime-fighting anthropomorphic alien ducks from a hockey obsessed planet called "puck world" in another dimension. Despite the utterly ridiculous set-up, though, the series is surprisingly much, much better than it sounds. Unfortunately, no one seemed willing to give it much of a chance. And it was cancelled after only one season.
Mission Hill has an In-Universe example in the episode "Plan 9 From Mission Hill". It turns out Wally made a Sci-Fi movie years ago that starred Gus, was full of plot holes, lousy special effects, and had a hat for a flying saucer. He has made every effort to make sure it is never seen by anyone until an old revival theater gets a hold of it and the movie gains legions of followers for how entertaining it is.
Mutilator: Hero of the Wasteland is an early 90s animation project in twoparts. It is horrible in every way imaginable: the art looks like something out of Liquid Television that didn't age well with perspective and anatomical issues up the hole, the sound is poorly mixed (with voices barely audible), and the plot is even worse: a man with a mechanical arm kills things in the wasteland. Yet somehow, the combination of these poor elements is nothing short of hilarious today. A cursory look through the YouTube comments reveals a general attitude that this was too good to last.
Imagine, if you will, Rob Liefeld's drawing used as a starting point, and then animated by the same people who made the Philips CD-i Zelda games, on a shoestring budget, while everyone involved was high as a kite, and you'll get close to understanding the animation style.
Her helmet seemed to be re-used for her Commander Hurricane role in "Hearth's Warming Eve", however.
That is to say, cool for a superhero. For a formal dance... perhaps not so much. Then again, her reason for attending was to crash the Wonderbolts' performance with her flying moves, so it makes sense she initially thought the dress would work.
Twilight's very awkward dance from "Sweet and Elite."
NFL RushZone: Guardians of the Core. It reaches The Room levels of this. The animation sucks, the characters are either dull, or blatant stereotypes, and the plot is a muddled mess. But, it's so awful it becomes very entertaining, and fun to riff on. Oh and the main character, Ish (yes, that is his actual name) looks like Michael Jackson, which is how it gained the nickname "MJ FOOTBALL".
The 2nd Season kicks this up a notch with the presense of Wild Card
The 1960s Spiderman cartoon counts. While the show did have many geniune fans, it also has a large So Bad It's Good fandom. All the camp of the Adam West Batman show (being as it, like the Batman show, crawled out of the goldmine of So Bad It's Good that was the Silver Age) add to that the most unsuitable voice ever for the guy who plays Spider-Man, low budget animation, and stock footage used over and over again, and it's very difficult for most viewers not to laugh at the hideous result. A monstrosity IN COLOR!
And speaking of color, the garish splattering of mismatched hues thrown all over the place (especially the sky) made New York city appear more radioactive than the Fallout universe.
Tiny Toon Adventures had an in-universe example when Buster, Babs and Plucky decided to make a non-comedy film. One of the studio's heads actually mentioned the trope. He didn't like it enough to the point of giving them other serious roles but enough to readmit them in comedy.
Gene Deitch was quite brilliant in his 1950s stylized modern work; he took the stodgy, flagging Terrytoons in an interesting direction. But when he took on the Tom and Jerry franchise in the early 1960s, it went in a whole weird Eastern European-filtered direction.
Toxic Crusaders, which ditched the R-rated qualities of Toxic Avenger and replaced them with hilariously ridiculous dialogue, plots, and animation. Many things made no sense whatsoever: Toxie went to live in the town dump after his mom suggested it, even though she had no problem in later episodes visiting him or boasting that he's her son. He also mentions later that he and his friends need to "pay rent" — to the dump?! All the mutants were called, every single time,"hideously deformed mutants of superhuman size and strength." There were constant ass pulls: when a Mad Scientist creates french fries that turn anyone who eats them into nearsighted, forgetful old people - his own words - it turns out that putting pepper on them turns the mutagen chemicals into bubble gum, which negates the process. There is also a Running Gag in which the Big Bad's main henchperson Psycho will predict, with eerie accuracy, exactly how their plans will be foiled. The Big Badnever listens; once, he tells Psycho to stop spoiling things for him. There's also lampshade-hanging galore.
Junkyard: Do we have time for a flashback? Toxie: Oh sure! It'll probably take Killemoff some time to come up with a new plan to destroy us.
After Killemoff loads a giant monster truck on a barge which predictably (Psycho said it would) sinks the whole thing to the bottom of the river:
Adventures of Sonic the Hedgehog. Whoooooo boy. Where to begin? This cartoon suffers from horrible, Off Model animation and terrible writing, thanks to a low budget and a five-days-a-week schedule that forced its creators to churn out more episodes rather than make better ones. This show lasted longer and had more episodes than its counterpart SatAM. But it is great riffing material! And those faces are so expressive. They make great reaction pics!
Wild Grinders has cliched plots that make no sense and pretty much should be called teen stereotype TV. It has gotten to the point to where everyone who watches it watches it to laugh at how bad it is.