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. by ttits January 6, 2008
Get the nikkimug. A SEXY GIRL WHO LIKES TO PLAY WARCRAFT. she likes to laze in the sun like a lizard and spoon with the dolphines. in here spare time when she is not found down the beach watching the early sunrise she will probably be found in a tree. she is my big spoon!
by qwertyuiop. October 9, 2008
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.