The most annoying term for a sister. Something that a girl says when she spends way too much time with her sister, who is apparently her only friend also.
A girls best friend. Seester is a word used when talking about you favorite sibling. Seesters share a bond that not many share, and nothing will ever compete with it!!
1. A loving nickname to call your sister. NOT used to describe a fellow sorority sister or close girlfriend.
2. Female sibling who you share a unique loving bond, despite any sibling rivalry.