bestie

[bes-tee]

noun

Origin of bestie

First recorded in 1990–95; best + -ie

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

The new way to show your love and affection for your bestie is with a fashionable Little Scocha friendship bracelet.
The Daily Beast’s 2014 Holiday Gift Guide: For the Blue Ivy in Your Life
Allison McNearney
November 29, 2014
Gomez voluntarily spent two weeks in rehab last month, and Demi sticks up for bestie Selena as she works out her emotional life.
Inside Philip Seymour Hoffman's Funeral; 'Lego Movie' Is Really Good
Culture Team
February 7, 2014

I ask, forgetful of the familiar sense of bestie, and figuring cougars at least by the word.
Suburban Sketches
William Dean Howells