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A person too lazy and dumb to get a job and instead sits on their butt playing video games all day.
My cousin is a J40k. He got fired and still plays Fortnite like it's his full-time job.
That guy at the mall is a J40k. He's been there since 9 AM and still hasn't bought anything.
My brother is a J40k. He said he'd get a job, but now he's just playing Call of Duty and eating pizza.