When someone acts older than their age thus making them look younger and dumb.
shitskia: I'm in love I know I'm only 14 but it might just be real!
Tanishia: Gurllll you got a bad case of grown syndrome
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A grown person 18 or over the age of 18.
That still lives with their parents.
Still watches cartoons, and eats cereal.
A grown person that still wants to be a kid.
Whoaa, did you see Carter ?
Yeah that nigga has grown kid syndrome.
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