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 30, 2015
Get the Nikkimug. a really awesome, pretty, crazy, funny, hurtful girl who likes to eat food including people. someone who likes to do random stuff and loves tokidoki
by b r i t e mango July 29, 2009
Get the Nikkimug. The coolest people you will ever meet they love to have fun and usually love running usually and is very athletic or flexible and is very enthusiastic they doesn't like to be alone and dont always tell the truth scared that theyll get judged Nikki's are always trying to make people smile and just want to be with someone who will give them a lot of attention Nikki's are very special so if you find a nikki dont let he/her go
by Frankie layn October 1, 2018
Get the Nikkimug. by DoYouWannaDie.gov May 22, 2016
Get the Nikkimug. Bitch is a penguin, Crazy and willing to delete her myspace over an ant farting
she lives in New Mexico and fucks the chupacabra all night long!
she lives in New Mexico and fucks the chupacabra all night long!
Oh my god Carly stop being such a Nikki over spilled milk we can clean it up...NO PUT DOWN THE KNIFE PLEASE DON'T END YOUR LIFE OVER THIS!!!!!!
by little miss bunny January 5, 2010
Get the Nikkimug. 
Get the Nikkimug. A complete Overt Narcissist in female form; Thinks she is the best looking, most talented, living in a grandiose fantasy land, can't stop taking selfies, has sex with everyone, and believes she is the most awesome person on earth. Deep down, she hates herself and everyone closest to her takes the blame for her total lack of know how on being an actual human being. Projection of guilt is her specialty most of all. If you meet one - RUN!!!
For example: I went thru my girls phone and the bitch nikki'd All of my friends then blamed me for it!
OR: I payed for both concert tickets and she pulled a nikki on me. So I didnt get to go, wasted my time & money, but she don't give a shit whatsoever.
OR: I payed for both concert tickets and she pulled a nikki on me. So I didnt get to go, wasted my time & money, but she don't give a shit whatsoever.
by 3rdiOpen November 15, 2018
Get the Nikkimug.