What is the meaning of Bestie?

best friend

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

friend (any in general)

beast, monster

beast (objectionable person)

beast

plural of bestia

nominative plural of bestia

accusative plural of bestia

vocative plural of bestia

beast, wild animal

plural of bestia

Source: wiktionary.org