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A grown-ass human who still lives with their parents and acts like they're still in high school, even though they're old enough to be a grandpa.
My brother is a galeny. He still plays video games all day and won't get a job.
My mom says I'm a galeny because I still live at home and eat her food for free.
My cousin is a galeny. He's 28 and still wears pajamas to work.