Thankfully, referring to someone as "pookie" is a term of affection, and it's a term that people use to refer to a friend, romantic partner, pet, or even a celebrity. The word is meant as a substitute for something like "sweetheart" in that it's designed to suggest a level of intimacy, and to show tenderness and affection between the person saying it and the person the nickname is referring to.
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As it becomes more widely adopted on the platform, the use of "pookie" shifts somewhat, but generally speaking, it's a way for people to refer to one another, and for some TikTok stars to refer to their fans.
Although the term has been popularized through its use on TikTok, it wasn't invented there, and it's possible that you've also seen it pop up on other social media apps or even in real-life conversations.
