Staci

A person who lies about them self, their family, their personal life etc. in order to gain popularity

(based on character "Staci" from Total Drama : Revenge of the Island)

Guy 1: "im dating this girl who works at nasa"
Guy 2: "you told me you where dating a girl who was a teacher last week "
Guy 1: "...no"
Guy 2: "... you are a Staci"