I have a friend who has been my friend, literally, forever. It is rare that we go more than a few days without some form of communication (generally instant messaging since she's not a phone sort of human). We live 3000 miles apart, but still manage to get together every couple of years.
The other night, she told me that she thinks of me as her sister. In fact, I nearly got to be her sister when the Grad Student was looking for a safe place to stash me.
The Bestie and I know all the intimate details of our lives. We can complain and whine to each other. We know when the other has a doctor's appointment or when to back off a touchy subject. And, we can give each other shit like no one else.
Next week, Bestie and I are getting together in New Orleans. We have a pre-arranged adventure I'll admit to later. But, in a drunken text conversation last week, we set up the shit we are going to inflict upon each other next week. At some point "hey, I have a nice ass. Very kickable" got texted to me and "I will help you find your tongue" got texted to her. Now, in an act of mutually assured humiliation, we are preparing t-shirts with those lovely sentiments on them. heh heh.
Also, we like to play drinking games. This trip, we're going to drink the alphabet. There are prizes for the two people in our party who get the most letters checked off. And, I need to remember to bring her the last liquor loaf. She's that sort of friend . . . the one I'd give my last liquor loaf to.