A standard sitcom family usually has one or more of the following: the [[MyBelovedSmother Beloved Smother]], the BrattyHalfPint, the [[BrattyTeenageDaughter Over-dramatic Teenage Daughter]] and the BumblingDad. Of course, to round out the [[NuclearFamily nuclear sitcom family]], there's one more element needed to balance out the 2.4 kids...

...the Dumbass Teenage Son.

Like the name suggests, the character is a male, a teenager, and incredibly stupid. Growing up and hitting puberty appears to have caused him to sacrifice some IQ points for height and [[CarpetOfVirility hair]]. Often looked at with disdain by the rest of the family who view him as an annoyance at the worst of times, the DumbassTeenageSon is often times easily tricked or manipulated by his other family members, even those younger than him. He has no aspirations of getting an education or a "real job", usually thinking about becoming a rock star despite [[DreadfulMusician lacking in musical talent]]. Sometimes, this character tends to pepper his sentences with TotallyRadical phrases like "Dude!" or "Awesome!".

Dumbass Teenage Sons are common in {{sitcom}}s, but can be found in other genres as well. Sometimes they are shown to be BookDumb or knowledgeable about certain things others don't know, but not all the time. They are rarely if ever the Main Character or get focused on unless it's being viewed with contempt by the rest of the family. May overlap with DumbJock if said teenager is portrayed as dimwitted but athletically fit. If he grows up and doesn't grow out of it, he's likely to become a BasementDweller.

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!!Examples:

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[[folder:Comic Books]]
* Downplayed with Peter Fox of ''ComicStrip/{{Foxtrot}}''. While he does play his electric guitar at wall-blasting volumes, he's otherwise mostly intelligent, his life revolving mostly around food and the fact that he can't seem to grow hair, gain weight or get muscles. A bad grade on a physics test was brought about by over-doodling on a diagram rather than a lack of brains.
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[[folder:Live Action TV]]
* Eric Matthews from ''Series/BoyMeetsWorld'', though like Brad he was a bit smarter than the rest of the examples here before becoming {{Flanderized}}.
* All over the place in the [[Franchise/{{DCLAU}} Disney Channel Live-Action Universe]]:
** Cameron's probably the third dumbest person in ''Series/ANTFarm'', behind his BumblingDad & Paisley TheDitz.
** PJ in ''Series/GoodLuckCharlie'' is a GeniusDitz. A good example would be his boss putting him on the case to find out whose been stealing chicken from the restaurant. [[spoiler:It was the boss himself, and he put PJ on the case because he figured he was too stupid to work it out]].
** Jackson in ''Series/HannahMontana'' comes off as this frequently, though he's more BookDumb than anything.
** Zack from ''Series/TheSuiteLifeOfZackAndCody'' was a BrattyHalfPint as well but got dumber as he got older. Averted with his twin brother, Cody, [[SiblingYinYang who became an]] InsufferableGenius.
** Like The Above In ''Series/WizardsOfWaverlyPlace'' Justin is always studying and top of the class in every Subject, Max on the other hand falls into this category. The beginning of the show had him as more of a CloudCuckooLander than a ditz, though he was {{Flanderized}} into being very ditzy.
* Drake from ''Series/DrakeAndJosh'' is like this, but at times is shown to be BrilliantButLazy. He devises a plan that would enable him and Josh to ride a Roller Coaster and be able to get back in time to watch over their Grandfather before their parents got back. Josh is stunned he's failing classes after hearing that.
* In ''Series/TheGeorgeLopezShow'', Max is depicted as being this, though he is later diagnosed with dyslexia. He also wasn't a teenager until the end of the show.
* Although he's smarter than most of those listed here. Brad from ''Series/HomeImprovement'' had his moments during the shows run.
* Reese from ''Series/MalcolmInTheMiddle''. To quote his own mother: "some people have book smarts, some people have street smarts, you have ''neither''." To a lesser extent, Francis, who is sent to military school before the start of the series, though he's more a troublemaker than an idiot.
* Axl from ''Series/TheMiddle''. He's both the oldest ''and'' the most immature of the Heck kids.
** Though Axl tends to falls heavily on the lazy side of the BrilliantButLazy scale. When cahllenged by his parents, Axl actually managed to maintain a 3.0 GPA in his first year of college.
* Junior from ''Series/MyWifeAndKids'', {{Flanderiz|ation}}ed to where even his little sister had to help him with his homework. Little sister is about ten years younger than him. He even once [[EpicFail forgot how to spell his own name.]]
* ''Series/That70sShow'': Eric is this in the eyes of his father Red, and while he's nowhere near as dumb as Kelso, neither is he a paragon of sensibleness. Then again, [[HatesEveryoneEqually everyone's]] a dumbass in Red's eyes.
* Jake from ''Series/TwoAndAHalfMen'' was originally a BrattyHalfPint, but as the show went on he got older and...dumber.
* Flashbacks in ''Series/{{Titus}}'' show the title character was this as a teenager. In every flashback he's a stoned, drooling idiot reeled in by his tough, badass father.
* Theo Huxtable from ''Series/TheCosbyShow'' starts off like this, with the first episode in particular demonstrating a lack of intelligence when it comes to school. Later on in the show's run, he's eventually diagnosed with dyslexia, and starts working to overcome it. By the end of the series, he's become a teacher.
* Eddie Winslow from ''Series/FamilyMatters'' starts as this but he grows out of it. He's pretty much only BookDumb by season 2, especially after his best friend Waldo is introduced and becomes the show's resident idiot.
* JT from ''Series/StepByStep'' is portrayed as an academically challenged slacker. Like Theo, he later finds out he has dyslexia.
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[[folder:Video Games]]
* Jimmy, [[PlayerCharacter Michael de Santa]]'s 20-year-old son in ''VideoGame/GrandTheftAutoV'', isn't a teenager anymore, but otherwise fits every other beat of this trope. He still lives with his parents, leeching off of them and doing nothing but sitting around all day playing video games and [[PrettyFlyForAWhiteGuy speaking in hip-hop slang]].
* Deconstructed with Inigo in ''VideoGame/FireEmblemAwakening''. During their B support his father accuses him of being a carefree fool who only cares about chasing skirts [[AngerBornOfWorry after Inigo is wounded in battle]], causing Inigo to promptly ''explode'' that no, that is ''not'' the case:
-->You may think me a dandy and a fool, but a lot of people depend on me in the future. Every day, I was out there [[OrphansOrdeal fighting Risen and risking my life]]. With everyone looking to me to be strong, I had no choice. I HAD to be invincible. I couldn't complain or show any weakness. Not with everyone else struggling in that [[BadFuture damn war-torn wasteland]]... Even with you and Mother gone, I had to pretend I was fine. That I wasn't hurting. I had to fight every day of my sorry life and [[StepfordSmiler wear a smile while I did it]]!
** Even more so: [[spoiler: If Chrom is Inigo's father, Chrom's Future Past talk with the Inigo of the other world reveals that this version of Chrom!Inigo (and most likely the one you recruit) '''additionally''' has massive issues because he views himself [[AlwaysSomeoneBetter as inferior as his older sister Lucina]], and believes himself to be unworthy of holding up Chrom's legacy. [[CrowningMomentOfHeartwarming But Chrom will tell him otherwise]].]]
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[[folder:Western Animation]]
* ''WesternAnimation/TheClevelandShow'' has Raymond, Tim the Bear's stoner son.
* Chris Griffin of ''WesternAnimation/FamilyGuy'' is one, but to due to [[OutOfFocus lack of focus]] the viewers don't really see him acting dumb.
* Joseph Gribble, Dale's son from ''WesternAnimation/KingOfTheHill''.
* Junyer Bear from the ''WesternAnimation/LooneyTunes'' Three Bears shorts. He appears to be a teenager, and yet he still wears diapers.
* WesternAnimation/TheSimpsons: Bart Simpson is often depicted as this during episodes that take place in {{the future}} when he and Lisa are growing up. Homer was one as well growing up.
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