I've stumbled upon this image of a narrow angle, coffee cup and the mathematical symbol of pi.
I get its reference to acute and pie, meaning a cutie pie.
But what on Earth is the coffee cup supposed to bring to the table?
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In one of the comments from the link provided, you'd see, "acute tea pie". So, it isn't necessarily a cup of coffee. A cup of tea, it is. Hence, 'A cutie pie'.