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A goody two shoes is someone who’s always trying to be perfect, like they’ve never messed up in their life. They act like they’re better than everyone else just because they never got detention.
My teacher’s favorite student is a goody two shoes. She never talks back, and she does every single assignment.
My cousin is a goody two shoes. She even wears a bra to school every day.
My friend’s sister is a goody two shoes. She didn’t even eat pizza at the party because it wasn’t healthy.