A "Boyfriend Girl" is a girl who can't seem to avoid having a boyfriend at all times. As soon as she's out one relationship, she's in another. The Boyfriend Girl is hardly ever single. This girl often uses boys to fill in the emptiness she feels inside, or to avoid getting to know/understand herself and learn who she is. This girl usually has low self esteem and doesn't see the good inside herself unless a boy (usually the current boyfriend or prospect) notices it.
Like the "Career Girl" who is addicted to success in her job, the "Boyfriend Girl" is addicted to having a boyfriend.
This girl usually overestimates the time she is single, often making flimsy excuses as to why it was necessary to enter a new relationship so early.
Usually, quickly after entering a new relationship, the Boyfriend Girl publically displays proof of her relationship by changing her status as "in a relationship" and/or posting "Myspace Style" photo(s) of herself and the new boyfriend making out.
Most boys who come in contact with the boyfriend girl are prospective boyfriends. Essentially, the Boyfriend Girl is a slut without the sexual acts.
Boyfriend Girl : I can't believe this! Josh dumped me! I'll never love again!
*two days later*
Boyfriend Girl : Hey, you guys, this is Mark, we're going out.