Definitions by girlll.

Bestie 

Either

a) A shortened version of 'best friends' for internet talk.
or
b) Someone who is really close to being categorized as a best friend, but not exactly one yet.

a) TTYL bestie! XOXOX lylas!

b) Jamie: You know you're my bestie for life, girl. Arianna: WHAT, I'M NOT YOUR BEST FRIEND!!?! WHAT KIND OF RELATIONSHIP IS THIS?

Bestie by girlll. November 15, 2009