Not to be confused with
the compound word girlfriend, a "girl friend" (two words) is a girl who is your friend, but
not a girlfriend.
Every guy should have a girl friend. A good girl friend is just like one of the guys, except a girl. Also, if you're going through shit with your girlfriend then it's
nice to know you have a female on your side.
Girl friends don't have to be unattractive, either. But keep in mind that a girl friend shouldn't be confused with a romance interest you're trying to buddy-up first-- Girl friends remain strictly really good friends, even best friends.