bestie

noun

1. (informal)A best friend.

   “You're supposed to be my bestie, Mel. We used to tell each other everything. So what's this Toby secret you can't tell me?”

   “Even back then, a party just wasn't a party without my bestie, and I was miserable for the last eight frames.”

   “On the way home, I got a joke text from my bestie.”

   “Gave me a cryptic, mostly frustrated-seeming look. Went upstairs with her bestie. To re-up, probably.”

   “After an oddly-placed sponsored All State commercial starring the Please Don’t Destroy boys, a group of gal pals surprise their pregnant bestie Kelsie (Chloe Fineman) and her long-suffering husband Matt (Andrew Dismukes) at their baby shower […]”

2. (informal)A term of address for someone, usually used to instruct, to make a statement, or to draw attention.
3. (informal)A friend (any in general).