The term "cutie pie" is an affectionate and playful way to refer to someone who is very cute or charming. It is often used to express endearment towards children, pets, or even friends and partners when they display sweetness or charm that makes them loveable.
The origin of the term "cutie pie" combines the word "cutie," which is a diminutive form of "cute," meaning attractive or charming. The term "pie" has been used in a similar affectionate manner, often implying something desired or cherished. The phrase likely emerged in the 20th century as a colloquial term of endearment.