A person who never breaks rules, always does extra and is generally unpopular and quiet. They snitch on people and get joy from telling people off.
Note: Clever people may not be goody goody two shoes.
Oh, that new kid is such a goody goody two shoes. He got rewarded for a good attitude every day and since he started coming to our school we've all been getting told off because he snitched on us!
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