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A j dot is a creepy little kid who sits in the corner and stares at you like you owe them money, even though they don't say anything. They just follow the cool kids around like a lost puppy, hoping someone will notice them.
My cousin is a j dot. He sits in the corner and stares at me like I wronged him.
At lunch, the j dot just watches everyone else eat like they’re doing a crime.
The j dot in my class follows me everywhere, even to the bathroom.