You're the second person in this thread to misspell "cutesie" like this... or is "cutsie" a regional spelling I'm not aware of, or another word altogether?

I've spelled it that way (and have seen it spelled that way) my whole life, but your comment made me look it up. I could only find it in one place:

https://www.urbandictionary.com/define.php?term=Cutsie

But my use of it predates the internet. I suspect this is a regionalism.

Don’t forget: cutesy!