A 13 year old boy is well.. A male which has turned 13. A boy of this age usually thinks he is bad ass, just because he has finally become a teenager. Usually, 13 year old males do not have any pubic hair, and have a brain mass that is equivalent to that of a mouse. They are very easy to troll online, and make a very excellent target to any beginning trolls. Encyclopedia Dramatica created a page about children of this age.

A 13 year old will usually try to act "Gangster", and will fail horribly at it. They will jack off to Pornhub about 3 times a day, and have little knowledge about female anatomy. Sad, isn't it?
*Adults are making a mature, humorous joke*
13 year old boy: Hahahah! That's classic! *Tries to act like he understands the joke*
*Adults facepalm*
by rodneyalcala June 26, 2010
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An age group actually really stupid, but their reputation is made worse by Encylopedia Dramatica.
In their article, it states that "13 year olds can also be from 10 to 18." Too bad ED is too stupid to realize that they are the ones 19+ writing articles on teenage boys...just saying. Oh, and this definition will cause a large amount of butthurt from EDers.
EDer: Fuck, this definition on 13 year old boys is really pissing me off! I'm gonna post this on ED so I can get all of my pedophile friends to back me up!
by PrinceKelso November 30, 2010
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A mug that has been around for 13 years, what do you expect?
Nice 13 year old mug you got
by The trend follower November 26, 2017
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'13 Year Old Boys' aren't always just 13, the age it ranges from is about 12-16. It is infectious, therefor, be careful of who you surround yourself with.

Listen bands like Avenged Sevenfold, Slipknot, and Hollywood Undead
Most times, they drink Monster Energy Drinks, and save the cans.
They generally wear baggy pants, skull T-Shirts, and DC shoes.
They think they can BMX or skateboard, when usually they can't.
Whenever they go out, they travel with they're friends more than likely.
They often times like girls who wear T-Shirts with dinosaurs and dragons on them, wear lots of fake bracelets, and wear fake glasses.
Frequently, they like their mom better than their dad.
And last, but not least, when they take pictures of themselves, their hair is in the way of their face.
Did you see all those 13 Year Old Boys riding their bikes down the street with their Monster Energy Drinks.
by ItsYourMom July 5, 2011
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Another less funnier variation of the meme I'm 12 years old and what is this?

Said in forums that restricts the registration of people below 13. If you put the original version of the meme, which is: I'm 12 years old and what is this? Mods might think that you're ACTUALLY 12 years old and ban you because they're dumbass pricks, or just have a reason to ban you for the lulz.
Person 1: "I'm 12 years old and what is this?"

Dumbass Mod: "You're 12 years old? This forum is for ages 13 and up! *Bans Person 1*"

Another day:

Person 2: "I'm 12 years old and what is this?"

Dumbass Mod: O rly? I know that's a meme, but you piss me off and I have a reason to ban you. *Bans for the lulz*"

Yet another day:

Person 3: "I'm 13 years old and what is this?"

Dumbass mod: I thought the meme was "I'm 12 years old and what is this." What the fuck is going on?"
by UrbanWolf2215 July 24, 2010
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Claire:im above average

Daniel:The Average height of a 13 year old girl is 5’6
Claire:im 5’4

Daniel:below average haha
by afromandan March 15, 2022
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