1 definition by GretzyFTW
Usually a girl that has big boobs and a big or medium sized butt, can be slutty, most often very full of herself and thinks she's so popular and better than everyone.
"Hey, did you see that girl? Yeah, she looks like a Nikki. Obviously with her slutty looks, she's a Nikki."
by GretzyFTW March 28, 2015