A "Coffee Chick" is a girl that will always be willing to know everything that is happening in your girlfriends life. Such as your private sex life, inter-relationship arguments and e.t.c. Your girlfriend's Coffee Chick will address herself as your friend, but always approaches you with a glare.

The vise-versa (a Boyfriend's guy friend), is often referred to as a "Beer Buddy" or "Beer Bud". This friend will listen, but often will be drunk so forgets it the next day. Or her doesn't care.

A gay man, who is best-friends with your girlfriend, is a "Coffee Guy"... same thing.