A goody-two shoes; an excessively or annoyingly virtuous person. One who abstains from drug use, sex, profanity, or other poor habits.
She doesn't smoke, drink, or curse so she's obviously a Mary Poppins.
I don't want to hang out with a Mary Poppins because she's likely to ruin a party with her good girl manners and butt kissing tendencies.
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