%% ZeroContextExample entries are not allowed on wiki pages. All such entries have been commented out. Add context to the entries before uncommenting them.
->'''Marge Simpson:''' ''"This town is a part of who you are. This is a Springfield Isotopes cap; when you wear it, you're wearing Springfield. When you eat a fish from our river, you're eating Springfield. When you make lemonade from our trees, you're drinking Springfield..."''\\
'''Bart Simpson:''' ''"Mom, when you give that lecture, you're boring Springfield."''\\
-- ''WesternAnimation/TheSimpsons'', "[[Recap/TheSimpsonsS6E24LemonOfTroy Lemon of Troy]]"

This what you get when a child believes they know better than adults, except this time, they actually do.

Almost always on the side of good, most likely belonging to the ChaoticGood category, this character isn't an indiscriminate back-answerer like the BrattyHalfPint but rather steps up when an unreasonable or outright abusive authority figure tries to do something stupid or horrible, instead of submitting quietly to their authority. Expect them to be quite [[DeadpanSnarker snarky]] about it, at least at first.

Unlike the BrattyHalfPint, who is almost always (and proudly) antagonistic and mostly exists to make TheHero's life miserable, the MouthyKid is almost always the protagonist or close to TheHero.

In the '50s the MouthyKid would have been [[DopeSlap slapped upside the head]] and shipped off to the MilitarySchool. Children were little angels, or at least tried to be (''LeaveItToBeaver'', ''MyThreeSons'', ''FamilyAffair''). That all changed when Arnold on ''DiffrentStrokes'' popularized the MouthyKid. Television parents have been dealing with attitude ever since.

Likely started out as a subversion of the ChildrenAreInnocent attitude that had prevailed since Victorian times.

See also: BrattyHalfPint and PluckyGirl. Contrast ConstantlyCurious, who talks as much but has less sass.

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!!Examples:

[[foldercontrol]]

[[folder: Anime and Manga ]]

* ''ShinChan'': Shinnosuke "Shin-chan" Nohara, although he is a five year old whose dialogue is pretty much [[ToiletHumor "farty poop fartfart"]], he crosses the realism line once he calls his mom flat-chested (in both the original and the GagDub).
%%* ''Anime/ScienceNinjaTeamGatchaman'': Jinpei "The Swallow".
* ''Manga/FullmetalAlchemist'': Edward Elric gets called out for it at one point. "An Edward who can't use alchemy is just another kid with a foul mouth."
* ''Anime/MazingerZ'': Shiro Kabuto. He is a DeadpanSnarker who has no trouble telling exactly what he thinks. His older brother, Kouji Kabuto finds them annoying sometimes because Shiro often thinks his actions or plans are dumb. He also appeared in ''Anime/GreatMazinger''.
** ''Anime/UFORoboGrendizer'': Goro Makiba, ActionGirl and Love Interest Hikaru Makiba's AnnoyingYoungerSibling. He is nosy and loud-mouthed, and loves teasing or taunting his sister.
* ''Manga/GetterRobo'': Genki Saotome is another example of child often tells what he thinks; a trait is not appreciated for the adults and teenagers he meets.
* ''LightNovel/{{Baccano}}'':
** Thanks to being OlderThanHeLooks even ''before'' {{Immortality}}, as well as an all-around smartass, Firo Prochainezo gives off this impression to nearly everyone he meets even between the ages of nineteen and ''ninety''.
** The odd case of Czeslaw Meyer, who has been ten years old for a couple hundred years. While he had a pretty rough time of things, someone decided to ThrowTheDogABone and give him a normal life. He spends the next seventy years in the novels invoking this trope, particularly while WalkingTheEarth.
* ''SuperMilkChan'': The title character is this. In the Creator/AdultSwim dub she regularly calls her friends dumbasses.
* Yuuki from ''Manga/BabySteps'', the youngest member of LoveInterest Natsu's tennis club who originally thought the protagonist Eiichirou was either a spy for another club or a "degenerate old stalker". Since then, he never misses an opportunity to give E-chan a hard time.
* ''Anime/AyanesHighKick'' has Ayane's [[AnnoyingYoungerSibling annoying younger brother]] Kenta, who we first see butting into an argument between Ayane and her mother about Ayane skipping school to attend a pro-wrestling tryout.
--> "There's no choice. Big sis isn't very bright, so she has to ''make a living with her body''!"
* Bikky in ''Manga/{{FAKE}}'' is a particularly mouthy BrattyHalfPint. Especially when he's mouthing off at ChivalrousPervert Dee whom he sees as nothing more than a HandsomeLech chasing after his adoptive father Ryo.
* [[Manga/InuYasha Shippo]] is this in his wiser moments.
[[/folder]]

%%[[folder: Comic Books ]]
%%* Calvin of ''CalvinAndHobbes''
%%[[/folder]]

[[folder:Film]]
* Mouth in ''Film/TheGoonies'' is appropriately nicknamed. "Shut up, Mouth!"
%%* ''IpMan 2'' has [[spoiler: the young Bruce Lee]].
* Ronnie, a middle schooler of hilarious retorts and apparently vast cinematographic knowledge, in ''RoleModels''
-->'''Danny:''' Pick us up in two hours.\\
'''Ronnie:''' Fuck you, Miss Daisy.
* [[ShortFilm Watch The Birdie]] an early Bob Hope film, has a mouthy little girl.
%%* ThePhiladelphiaStory/[[AllMusicalsAreAdaptations High Society]] has Dinah.
%%* ''TrueGrit'' has Mattie Ross, a much more serious example.
* ''Franchise/StarWars'': The young Anakin Skywalker from ''Film/ThePhantomMenace'' was given this characterization. He may be a kid with an attitude, but he's still well-meaning and have a reputation to build and repair anything. He's also willing to risk his own well-being to help others in need.
[[/folder]]

[[folder:Literature]]
%%* ''{{IT}}'' by Creator/StephenKing: Richie Tozier.
%%* ''Literature/TheBabySittersClub'': Karen.
* In ''Literature/TimeEnoughForLove'', protagonist Lazarus Long [[TimeTravel travels back in time]] to meet his family in 1917 Kansas City, Missouri. There he encounters his [[MyFutureSelfAndMe past self]], Woody, who is already an up-and-comer, about as shrewd, stubborn, and mouthy as it's possible for a five-year old to be, and kept in line only with generous application of paddle to arse. His (and Lazarus') grandfather Ira remarks -- in unknowing irony -- that the kid is going somewhere, if he somehow makes it to adulthood without being murdered by his parents. He has no idea.
* Matteo Ta'anari in ''Literature/SomeoneElsesWar''. But only to kids his own age--never to adults or small children. And he doesn't get shipped off to military school so much as shipped off [[ChildSoldiers to the military]].
[[/folder]]

[[folder: Live Action TV ]]
* Cory Matthews in ''BoyMeetsWorld" was this in the first season. Subverted in that he often doesn't know better than the adults which is the entire point of each episodes with him admitting he doesn't know better by the end of each episode
* ''ModernFamily'': Alex, the middle child. She does little else on the show than make snarky comments.
* ''LeaveItToBeaver'': Exception that defines the rule: Eddie Haskell -- bratty around his peers, but with a nice phony front of shallow flattery while he was around adults.
* ''MalcolmInTheMiddle'': All of the boys. Francis is sent off. His advice helps keep Malcolm from the same fate.
* ''ThePartridgeFamily'': Danny Bonaduce's character is bratty around his peers but puts on a nice front around adults.
* Darlene Connor of ''{{Roseanne}}'' epitomizes this trope in the early seasons until she grows into quite the DeadpanSnarker as the show focuses more on her. DJ also sometimes fell into this trope as well.
* ''Series/{{Skins}}'' : James Fitch (Katie and Emily's kid brother), most likely due to the influence of his (unseen) friend Gordon [=MacPherson=].
-->"I want fish and chips! This tastes like bollocky wankshite!"
-->"Gordon [=MacPherson=] says you call them dykes, because you have to stick your finger in them."
-->"I want to fuck Naomi [beat] I do, get over it."
* ''WelcomeBackKotter'' : While the Sweathogs are considerably older than the usual MouthyKid, they form an obvious precedent.
* ''BadBoy'': Moon Won In in this KoreanDrama: she sneaks beers from her sister, tries to buy cigarettes even though she's underage, and in one episode steals money from an apparently unconscious man.
%%* ''{{Misfits}}'': Nathan Young
%%* GoodLuckCharlie: Gabe Duncan is this trope.
* ''Series/OnlyFoolsAndHorses'': Damien Trotter
[[/folder]]

[[folder:Radio]]
* Possibly the UrExample, Fanny Brice's Baby Snooks was somewhere in between this and ConstantlyCurious. Her sole reason for existence appeared to be to drive her father to the very brink of insanity, but she did it without apparent malice -- just pure innocent mischief. And given that the character was created in 1912, and continued to be wildly popular until Brice's death in 1951, it shows that Arnold from ''DiffrentStrokes'' far from created the trope -- he just incarnated it for a new, more relaxed generation.
[[/folder]]

%%[[folder:Theater]]
%%* Moth from Creator/WilliamShakespeare's ''LovesLaboursLost''.
%%[[/folder]]

[[folder: Video Games ]]
* In ''VideoGame/{{Fallout 3}}'' there's a town called Little Lamplight, which banishes its residents when they turn 16. Because of this, the town is filled with kids who walk around swearing because there's no one to tell them no. In fact, the mayor's greeting to you is basically "who the fuck are you?".
* [[spoiler: Nall's human form]] in Lunar Eternal Blue, at least that's what he seems like at first...
[[/folder]]

[[folder: Western Animation ]]
* ''BeavisAndButthead'': Mike Judge said that dialogue is a better reflection of the real-life Mouthy Kid -- not too clever, relies heavily on toilet humor -- because in reality, kids aren't as smart as a roomful of Harvard-graduate writers.
* Toph Beifong from ''WesternAnimation/AvatarTheLastAirbender'' practically defines this trope. She is not afraid to speak her mind or tell someone off, no matter their position or title in life.
%%* Artie Smarty in ''WesternAnimation/KimPossible''.
%%* ''WesternAnimation/TheSimpsons'' : A popular example: Bart Simpson. And Lisa Simpson.
* ''StarWarsTheCloneWars'': has Ahsoka Tano in a very odd example, seeing as Jedi Padawans are encouraged to be respecteful.
%%* ''WesternAnimation/DarkwingDuck'' has the title character's adopted daughter, Gosalyn, who is quite a handful (while also often helping to save the day).
%%* ''WesternAnimation/{{Ben 10}}''.
%%* Marcia the marsupial mouse from ''BlinkyBill''.
%%* ''ScoobyDoo'': [[TheScrappy Scrappy Doo]].
[[/folder]]
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