The word "bestie" is a colloquial term used to refer to one's closest friend or best friend. It conveys a sense of affection and camaraderie, implying a strong bond between individuals who share mutual trust, support, and fun experiences together. People often use "bestie" in a casual or playful context.
The term "bestie" is derived from the word "best," which means the highest quality or the most favorable compared to others. The suffix "-ie" is often used in informal English to create a more affectionate or diminutive form. "Bestie" likely emerged in the late 20th century, particularly in youth and pop culture.