A cress
A cress is someone who’s got a head full of hair and a brain full of ideas, and they’ll probably judge you for not knowing what a crescent is.
My teacher is a cress, she knows everything and will make you do 100 push-ups if you mess up.
My cousin is a cress, he memorized the whole dictionary and still fights with his sister.
My neighbor is a cress and she once told me I had ‘lackluster vibes.’