Either He/She wants to kill themselves, or is about to shoot up the whole school.

To avoid getting killed by the quiet kid is to get on his good side by being nice and kind to him such as: Helping him when he's struggling at doing something, protecting him from bullies, etc
Person 1: HOLY SHIT THE QUIET KID IS SHOOTING EVERYONE BUT HE'S SPARING ADRIAN????
by Kid_Who_Gives_Knowledge March 5, 2022
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The kid who sits at the back of the class, usually white, who never talks to anyone and feels insulted that people look at them negatively for their lack of social skills usually leading to mass murder of children especially in America.
Person 1: Hey look, the quiet kid brought his backpack to class today, and it looks pretty heavy
Person 2: Pardon?
by Tapwaterturnsfrogsgay March 14, 2020
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The kid that doesn't say anything in class, and scares everyone in one way. Despite being unpopular, everyone knows him for some reason. The only noise you will ever hear from him is the sound of Pumped Up Kicks from his headphones and the cocking of his gun.
Quiet Kid: Reaches into his bag
The entire class: Leaves
by QueenObama2 November 4, 2021
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The kid in class who doesn’t say a word and then suddenly has some sort of an amazing talent that you probably didnt expect.
Rick: dude, have you seen Gertrude? Like, she’s The Quiet Kid In Class, like, she hasn’t said ANYTHING this first week of year 7. But, like, have u seen her art? It’s incredible!
Astley: yeah dude! She didn't even talk to me and I’m a big nerd and simp!
by chickenchowmein2007 August 5, 2021
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You know the kid. They often wear darker clothes, though it isn't necessary. Normally, this kid will talk to an elite few classmates who don't bug them, make fun of them, or bring them into irrelevant conversations. When you get to know that quiet kid, you can discover they are an individual person with lots of funny thoughts inside. They simply choose to keep them there. When they choose to let their thoughts out, the students laugh, but they're usually good kids, so the teacher's let it slide. Some speak more "properly" than others, depending on their sense of humor.
Mrs. Daniels: Justine, describe phagocytosis for the class.
*class considers whether there is actually a Justine in the school*
Justine: It's like when the space ship comes for the slime monster during its attempt at world domination, but the slime monster makes itself grow a little and eats it.
*class laughs*

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Mrs. Powers: And they all lived happily ever after... maybe... or maybe they all died.
Justine: Of course they died... this book was written two hundred years ago.
...
Crystal: Did you hear what Justine said in English?
Amanda: That girl's name is Justine?.. It's always the quiet kid in the corner.
by bumblebreeze January 11, 2011
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Usually the kid who has an AK-47 in their backpack.
Teacher: What comes before 47?
Quiet kid: AK
by EmanGaming232 July 22, 2021
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