na-na
A nickname for the female genitalia, like when you're being extra and need to call it something fancy.
My friend said na-na is her favorite nickname. I asked why, and she said it sounds cute.
He called it na-na instead of just saying it. I thought he was trying to be a smartass.
She said her grandma calls it na-na. I thought that was the weirdest thing I've ever heard.