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A person who's super religious - like Christian mothers.
Oliv: Hey Kailee, wanna hang tomorrow?

Kailee: Oh my goodness, no! I have church tomorrow and then practice for the choir. Besides my mother wants a family dinner for mass prayer, and you have brothers. Maybe next time!
Oliv after Kailee leaves: Oh my God she's such a sundie.
by can't find a username fam July 15, 2018
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