Christina is a serious shoplete. She routinely practices honing style skills (at the mall), studying the game (Vogue, E! TV, and What Not to Wear) and showing off her talent for fashion to appease an audience (at the bar, club or various social events).
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!