Usually a girl who is very selfish and self-centered. She cares about no one but herself. She seldom cries because she's a cold-hearted bitch. You might think she's a good friend but she will turn around and stab you in the back quick. Never trust a Nicky. Also, she is very ugly but tries to flaunt herself, but she really just comes off as a slut.. which she is.
"Oh my gosh. That girl acts like such a Nicky."