What is the meaning of Bestie?

A best friend.

A term of address for someone, usually used to instruct, to make a statement, or to draw attention.

A friend (any in general).

beast, monster

beast (objectionable person)

beast

plural of bestia

bestie, best friend

nominative plural of bestia

accusative plural of bestia

vocative plural of bestia

bestie (best friend)

beast, wild animal

plural of bestia

Source: wiktionary.org