Very Best Friend
That one friend that you've known forever, and is always there for you (when their not being a pain in the but), that you refuse to call a BFF because it is far too cheesy. Also known as VBF.
Person 1: Hey, is Jane your BFF?
Person 2: No way! She's my Very Best Friend, and always will be.
Person 2: No way! She's my Very Best Friend, and always will be.