Definition

From Enid Blyton literature, slang for someone genuinely altruistic, selfless, and endlessly considerate of others—basically the golden retriever incarnate as a human.

Example Usage

She volunteers every weekend and always puts everyone else first; she's pretty pi, honestly.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Pi.&defid=5708111)

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